### Note for owners of Malyan M200/Monoprice Select Mini
OctoPrint's firmware autodetection is now able to detect this printer. Currently when this printer is detected, the following firmware specific features will be enabled automatically:
* Always assume SD card is present (`feature.sdAlwaysAvailable`)
* Send a checksum with the command: Always (`feature.alwaysSendChecksum`)
Since the firmware is a very special kind of beast and its sources are so far unavailable, only tests with a real printer will show if those are sufficient settings for communication with this printer to fully function correctly. Thus, if you run into any issues with enabled firmware autodetection on this printer model, please add a comment in [#1762](https://github.com/foosel/OctoPrint/issues/1762) and explain what kind of communication problem you are seeing. Also make sure to include a [`serial.log`](https://github.com/foosel/OctoPrint/blob/master/CONTRIBUTING.md#where-can-i-find-those-log-files-you-keep-talking-about)!
### Bug fixes
* [#1942](https://github.com/foosel/OctoPrint/issues/1942) - Fixed crash on startup in case of an invalid default printer profile combined with "auto-connect on startup" being selected and the printer available to connect to.
* None since this constitutes a hotfix release to fix an apparently very rare bug introduced with 1.3.3 that seems to be affecting a small number of users.
OctoPrint's firmware autodetection is now able to detect this printer. Currently when this printer is detected, the following firmware specific features will be enabled automatically:
Since the firmware is a very special kind of beast and its sources are so far unavailable, only tests with a real printer will show if those are sufficient settings for communication with this printer to fully function correctly. Thus, if you run into any issues with enabled firmware autodetection on this printer model, please add a comment in [#1762](https://github.com/foosel/OctoPrint/issues/1762) and explain what kind of communication problem you are seeing. Also make sure to include a [`serial.log`](https://github.com/foosel/OctoPrint/blob/master/CONTRIBUTING.md#where-can-i-find-those-log-files-you-keep-talking-about)!
* [#478](https://github.com/foosel/OctoPrint/issues/478) - Made webcam stream container fixed height (with selectable aspect ratio) to prevent jumps of the controls beneath it on load.
* [#748](https://github.com/foosel/OctoPrint/issues/748) - Added delete confirmation and bulk delete for timelapses. See also the discussion in brainstorming ticket [#1807](https://github.com/foosel/OctoPrint/issues/1807).
* [#1092](https://github.com/foosel/OctoPrint/issues/1092) - Added new events to the file manager: `FileAdded`, `FileRemoved`, `FolderAdded`, `FolderRemoved`. Contrary to the `Upload` event, `FileAdded` will always fire when a file was added to storage through the file manager, not only when added through the web interface. Extended documentation accordingly.
* [#1521](https://github.com/foosel/OctoPrint/issues/1521) - Software update plugin: Display timestamp of last version cache refresh in "Advanced options" area.
* [#1734](https://github.com/foosel/OctoPrint/issues/1734) - Treat default/initial printer profile like all other printer profiles, persisting it to disk instead of `config.yaml` and allowing deletion. OctoPrint will migrate the existing default profile to the new location on first start.
* [#1734](https://github.com/foosel/OctoPrint/issues/1734) - Better communication of what actions are available for printer profiles.
* [#1739](https://github.com/foosel/OctoPrint/issues/1739) - Software update plugin: Added option to hide update notification from users without admin rights, added "ignore" button and note to get in touch with an admit to update notifications for non admin users.
* [#1762](https://github.com/foosel/OctoPrint/issues/1762) - Added Malyan M200/Monoprice Select Mini to firmware autodetection.
* [#1811](https://github.com/foosel/OctoPrint/issues/1811) - Slight rewording and rearrangement in timelapse configuration, better feedback if settings have been saved.
* [#1818](https://github.com/foosel/OctoPrint/issues/1818) - Support both Marlin/Repetier and Smoothieware interpretations of `G90` after an `M83` in GCODE viewer and analysis. Select "G90/G91 overrides relative extruder mode" in Settings > Features for the Smoothieware interpretation.
* [#1858](https://github.com/foosel/OctoPrint/issues/1858) - Announcement plugin: Images from registered feeds now are lazy loading.
* [#1875](https://github.com/foosel/OctoPrint/issues/1875) - Marked the command input field in the Terminal tab as not supporting autocomplete to work around an issue in Safari. Note that this is probably only a temporary workaround due to browser vendors [working on deprecating `autocomplete="off"` support](https://bugs.chromium.org/p/chromium/issues/detail?id=468153#c164) and a different solution will need to be found in the future.
* Added link to [`SerialException` FAQ entry](https://github.com/foosel/OctoPrint/wiki/FAQ#octoprint-randomly-loses-connection-to-the-printer-with-a-serialexception) to terminal output when such an error is encountered, as suggested in [#1876](https://github.com/foosel/OctoPrint/issues/1876).
* Force refresh of settings on login/logout.
* Made system wide API key management mirror user API key management.
* Make sure to always migrate and merge saved printer profiles with default profile to ensure all parameters are set. Should avoid issues with plugins trying to save outdated/incomplete profiles.
* Added note on lack of language pack repository & to use the wiki for now.
* Earlier validation of file to select for printing.
* Limit verbosity of failed system event handlers.
* Made bundled python client `octoprint_client` support multiple client instances.
* Disable "Reload" button in the "Please reload" overlay once clicked, added spinner.
* Updated pnotify to 2.1.0.
* Get rid of ridiculous float precision in temperature commands.
* Detect invalid settings data to persist (not a dict), send 400 status in such a case.
* More logging for preemptive caching, to help narrow down any performance issues that might be related to this.
* Further decoupling of some startup tasks from initial server startup thread for better parallelization and improved startup times.
* Announcement plugin: Subscribe to all registered feeds by default to ensure better communication flow (all subscriptions but the "Important" channel can however be unsubscribed easily, added corresponding note to the notifications and also a configuration button to the announcement reader).
* Announcement plugin: Auto-hide announcements on logout.
* Announcement plugin: Order channels server-side based on new order config setting.
* Plugin manager: Show warning when disabling a bundled plugin that is not recommended to be disabled, including a reason why disabling it is not recommended. Applies to the bundled announcement, core wizard, discovery and software update plugins.
* Plugin manager: Support for plugin notices for specific plugins from the plugin repository, e.g. to inform users of specific plugins about known issues with the plugin or instruct to update when the software update mechanism of the current plugin version turns out to be misconfigured. Supports matching installed plugin versions and OctoPrint versions to target only affected users.
* Plugin manager: Better visualization of plugins disabled on the repository, no longer shown as "incompatible" but "disabled", with link to the plugin repository page that contains more information.
* Plugin manager: Detect necessity to reinstall a plugin provided through archive URL or upload and immediately do that instead of reporting an "unknown error" without further information.
* Plugin manager: Added `freebsd` for compatibility check.
* Plugin manager: More general flexibility for OS compatibility check:
* Support for arbitrary values to match against
* Allow 1:1 check again `sys.platform` values (with `startswith`).
* Support black listing (`!windows`) additionally to white listing. A detected OS must match all provided white list elements (if the white list is empty that is considered to be always the case) and none of the black list elements (if the black list is empty that is also considered to be always the case).
* Software update plugin: New check type `bitbucket_commit` (see also [#1898](https://github.com/foosel/OctoPrint/pull/1898))
* Docs: Now referring to dedicated Jinja 2.8 documentation as hosted at [jinja.octoprint.org](http://jinja.octoprint.org) for all template needs, to avoid confusion when consulting current Jinja documentation as available on its project page (2.9+, which OctoPrint can't upgrade to due to backwards incompatible changes).
* Docs: Better documentation of what kind of input the `FileManager` accepts for `select_file`.
* Docs: Specified OctoPrint version required for plugin tutorial.
### Bug fixes
* [#202](https://github.com/foosel/OctoPrint/issues/202) - Fixed an issue with the drag-n-drop area flickering if the mouse was moved too slow while dragging (see also [#1867](https://github.com/foosel/OctoPrint/pull/1867)).
* [#1671](https://github.com/foosel/OctoPrint/issues/1671) - Removed obsolete entry of no longer available filter for empty folders from file list options.
* [#1821](https://github.com/foosel/OctoPrint/issues/1821) - Properly reset "Capture post roll images" setting in timelapse configuration when switching from "off" to "timed" timelapse mode.
* [#1822](https://github.com/foosel/OctoPrint/issues/1822) - Properly reset file metadata when a file is overwritten with a new version.
* [#1836](https://github.com/foosel/OctoPrint/issues/1836) - Fixed order of `PrintCancelled` and `PrintFailed` events on print cancel.
* [#1837](https://github.com/foosel/OctoPrint/issues/1837) - Fixed a race condition causing OctoPrint trying to read data from the current job on job cancel that was no longer there.
* [#1838](https://github.com/foosel/OctoPrint/issues/1838) - Fixed a rare race condition causing an error right at the very start of a print.
* [#1863](https://github.com/foosel/OctoPrint/issues/1863) - Fixed an issue in the analysis of GCODE files containing coordinate offsets for X, Y or Z via `G92`, leading to a wrong calculation of the model size thanks to accumulating offsets.
* [#1882](https://github.com/foosel/OctoPrint/issues/1882) - Fixed a rare race condition occurring at the start of streaming a file to the printer's SD card, leading to endless line number mismatches.
* [#1884](https://github.com/foosel/OctoPrint/issues/1884) - CuraEngine plugin: Fixed a potential encoding issue when logging non-ASCII parameters supplied to CuraEngine
* [#1891](https://github.com/foosel/OctoPrint/issues/1891) - Fixed error when handling unicode passwords.
* [#1893](https://github.com/foosel/OctoPrint/issues/1893) - CuraEngine plugin: Fixed handling of multiple consecutive uploads of slicing profiles (see also [#1894](https://github.com/foosel/OctoPrint/issues/1894))
* [#1897](https://github.com/foosel/OctoPrint/issues/1897) - Removed possibility to concurrently try to perform multiple tests of the configured snapshot URL.
* [#1906](https://github.com/foosel/OctoPrint/issues/1906) - Fixed interpretation of `G92` in GCODE analysis.
* [#1907](https://github.com/foosel/OctoPrint/issues/1907) - Don't send temperature commands with tool parameter when a shared nozzle is defined.
* [#1917](https://github.com/foosel/OctoPrint/issues/1917) (regression) - Fix job data resetting on print job completion.
* [#1918](https://github.com/foosel/OctoPrint/issues/1918) (regression) - Fix "save as default" checkbox not being disabled when other controls are disabled.
* [#1919](https://github.com/foosel/OctoPrint/issues/1919) (regression) - Fix call to no longer existing function in Plugin Manager UI.
* [#1934](https://github.com/foosel/OctoPrint/issues/1934) (regression) - Fix consecutive timed timelapse captures without configured post roll.
* Fixed API key QR Code being shown (for "n/a" value) when no API key was set.
* Fixed timelapse configuration API not returning 400 status code on some bad parameters.
* Fixed a typo (see also [#1826](https://github.com/foosel/OctoPrint/pull/1826)).
* Fixed `filter` and `force` parameters on `/api/files/<origin>`.
* Fixed message catchall `*` not working in the socket client library.
* Fixed analysis backlog calculation for sub folders.
* Fixed `PrinterInterface.is_ready` to behave as documented.
* Use black listing instead of white listing again to detect if the `daemon` sub command is supported or not. Should resolve issues users of FreeBSD and the like where having with `octoprint daemon`.
* Use `pip` instead of `python setup.py develop` in `octoprint dev plugin:install` command to avoid issues on Windows.
* Docs: Fixed a wrong command in the plugin tutorial (see also [#1860](https://github.com/foosel/OctoPrint/pull/1860)).
**If you maintain a plugin that extends OctoPrint's [JavaScript Client Library](http://docs.octoprint.org/en/master/jsclientlib/index.html)** like demonstrated in e.g. the bundled Software Update Plugin you'll need to update the way you register your plugin to depend on `OctoPrintClient` and registering your extension as shown [here](https://github.com/foosel/OctoPrint/blob/6e793c2/src/octoprint/plugins/softwareupdate/static/js/softwareupdate.js#L1-L84) instead of directly writing to `OctoPrint.plugins` (like it was still done [here](https://github.com/foosel/OctoPrint/blob/23744cd/src/octoprint/plugins/softwareupdate/static/js/softwareupdate.js#L1-L81)). That way your extensions will be available on all instances of `OctoPrintClient`, not just the global instance `OctoPrint` that gets created on startup of the core web interface.
If all you plugin does with regards to JavaScript is registering a custom view model and you have no idea what I'm talking about regarding extending the client library, no action is necessary. This heads-up is really only relevant if you extended the JavaScript Client Library.
- [#732](https://github.com/foosel/OctoPrint/pull/732) - Have OctoPrint's `python setup.py clean` build on stock
`python setup.py clean` for better compatibility with packaging systems
- [#1506](https://github.com/foosel/OctoPrint/issues/1506) - Better handle really long "dwell"/`G4` commands on Repetier firmware (as for example apparently recommended to use with Wanhao D6 and similar printers for nozzle cooling) by actively stalling communication from OctoPrint's side as well. That way we no longer run into a communication timeout produced by a 5min dwell immediately happily acknowledged by the printer with an `ok`.
- [#1542](https://github.com/foosel/OctoPrint/issues/1542) - Support for multi-extruder setups with a shared single nozzle and heater (e.g. E3D Cyclops, Diamond hotend, etc).
- [#1676](https://github.com/foosel/OctoPrint/issues/1676) - Trigger line number reset when connected to printer and seeing `start` message. This should fix issues with printer communication when printer resets but reset goes otherwise undetected.
- [#1681](https://github.com/foosel/OctoPrint/issues/1681) - Support for connecting to multiple OctoPrint instances via the [JavaScript Client Library](http://docs.octoprint.org/en/master/jsclientlib/index.html).
- [#1712](https://github.com/foosel/OctoPrint/issues/1712) - Display current folder name in file list if in sub folder.
- [#1723](https://github.com/foosel/OctoPrint/issues/1723) - Ignore leading `v` or `V` on plugin version numbers for version checks in plugin manager and software updater (see also [#1724](https://github.com/foosel/OctoPrint/pull/1724))
- [#1770](https://github.com/foosel/OctoPrint/issues/1770) - Better resilience against null bytes received from the printer for whatever reason.
- [#1770](https://github.com/foosel/OctoPrint/issues/1770) - Detect printer as connected even when only receiving a `wait` instead of `ok`. Should solve issues with initial connect where printer sends garbage over the line that eats/covers the `ok` if printer also sends regular `wait` messages when idle.
- [#1780](https://github.com/foosel/OctoPrint/issues/1780) - Work around for Safari re-opening one copy of the webcam stream after the other and eating up bandwidth unnecessarily (see also [#1786](https://github.com/foosel/OctoPrint/issues/1786))
- [#1805](https://github.com/foosel/OctoPrint/issues/1805) - Better error resilience against invalid print history data from plugins that replace the printer communication.
- Better error resilience in Plugin Manager against wonky version data in repository file.
- Added a "Restart in safe mode" system menu entry that will always be available if the restart command is configured
- CLI: Only offer `daemon` sub command on Linux (since that it's the only OS it works on)
- Less throttling of analysis of GCODE files from the analysis backlog. Should still leave Pi and friends air to breathe but allow a slightly faster processing of the backlog.
- Log OctoPrint version & plugin list when detecting log rollover.
- Allow `UiPlugin`s to define additional fields for ETag generation.
- Allow `UiPlugin`s utilizing OctoPrint's stock templates to filter out what they don't need.
- Locales contained in `translations` of plugins will now be registered with the system. That way it's possible to provide translations for the full application through plugins.
- Abort file analysis if file is about to be overwritten
- More solid parsing of request line number for resend requests. Should improve compatibility with Teacup firmwares. Based on issue reported via PR [#300](https://github.com/foosel/OctoPrint/pull/300)
- [#733](https://github.com/foosel/OctoPrint/issues/733) - Fixed multiple event handler commands running concurrently. Now they run one after the other, as expected.
- [#1317](https://github.com/foosel/OctoPrint/issues/1317) - Fixed a color distortion issue when rendering timelapses from higher resolution source snapshots that also need to be rotated by adjusting `ffmpeg` parameters to avoid an unexpected behaviour when a pixel format and a filter chain are required for processing.
- [#1631](https://github.com/foosel/OctoPrint/issues/1631) - Disable "Slice" button in slice dialog if a print is ongoing and a slicer is selected that runs on the same device as OctoPrint. The server would already deny such requests (simply due to performance reasons), but the UI didn't properly reflect that yet.
- [#1671](https://github.com/foosel/OctoPrint/issues/1671) - Removed "Hide empty folders" option from file list. Didn't really add value and caused usability issues.
- [#1771](https://github.com/foosel/OctoPrint/issues/1771) - Fixed `_config_version` in plugin settings not being properly updated.
- [#1732](https://github.com/foosel/OctoPrint/issues/1732) - Fixed a bug in the documentation for the printer profile API
- [#1760](https://github.com/foosel/OctoPrint/issues/1760) - Fixed missing reselect of selected file when updating via the watched folder, causing wrong progress percentages to be reported.
- [#1765](https://github.com/foosel/OctoPrint/issues/1765) - Fixed watched folder not waiting with file move until file stopped growing, causing wrong progress percentages to be reported.
- [#1777](https://github.com/foosel/OctoPrint/issues/1777) - Fixed z-change based timelapses with Slic3r generated z-hops not properly triggering snapshots.
- [#1792](https://github.com/foosel/OctoPrint/issues/1792) - Don't tell Safari we are "web-app-capable" because that means it will throw away all cookies and the user will have to constantly log in again when using a desktop shortcut for the OctoPrint instance.
- [#1812](https://github.com/foosel/OctoPrint/issues/1812) - Don't scroll up navigation in settings when switching between settings screens, very annoying on smaller resolutions (see also [#1814](https://github.com/foosel/OctoPrint/pull/1814))
- Fix settings helper not allowing to delete values for keys that are present in the local config but not in the defaults.
- Fix wrong replacement value for `__progress` in registered command line or GCODE [event handlers](http://docs.octoprint.org/en/master/events/index.html).
- Don't remove manual software update configurations on settings migration.
- Properly delete old restart/reboot commands that are now defined globally since config version 4. An issue with the settings helper prevented us from properly deleting them during migration to version 4.
- Fixed `python_checker` version check method and `python_updater` update method.
- Fixed update configs without a restart of any kind causing an issue due to an undefined variable.
- Fixed broken doctests.
- Upgrade LESS.min.js from 2.7.1 to 2.7.2 to fix the broken contrast function
- Always create a new user session for requests with an API key
- Fixed an error when reading all user settings via the API
- Fixed a bunch of caching issues for the page, was not properly updated on change of snapshot URL presence, system menu entry presence, gcode viewer enabled/disabled, changes in access control availability.
#### If you installed OctoPrint manually and used the included init script, you need to update that
The init script so far shipped with OctoPrint contained a [bug](https://github.com/foosel/OctoPrint/issues/1657) that causes issues with OctoPrint 1.3.0 and higher. Please update your init script to the fixed version OctoPrint now ships under `scripts`:
#### Change in stock terminal filter configuration
1.3.1 fixes an issue with the two terminal filters for suppressing temperature and SD status messages and adds a new filter for filtering out firmware `wait` messages. These changes will only be active automatically though for stock terminal filter configurations. If you have customized your terminal filters, you'll need to apply these changes manually under "Settings > Terminal filters":
- [#1607](https://github.com/foosel/OctoPrint/issues/1607) - Way better support for password managers (e.g. browser built-in, 1Password, Lastpass, Dashlane)
- [#1638](https://github.com/foosel/OctoPrint/issues/1638) - Make confirmation dialog when cancelling a print optional.
- [#1656](https://github.com/foosel/OctoPrint/issues/1656) - Make wording of buttons on print cancel dialog less confusing.
- [#1705](https://github.com/foosel/OctoPrint/pull/1705) - Simplified install process on Mac by removing dependency on pyobjc.
- [#1706](https://github.com/foosel/OctoPrint/pull/1706) - Added a mask icon for Safari pinned tab and touchbar.
- Support extraction of filament diameter for volume calculation from GCODE files sliced through Simplify3D.
- Abort low priority jobs in the file analysis queue when a high priority job comes in - should make file analysis and hence time estimates show up faster for newly uploaded files.
- Added a terminal filter for firmware `wait` messages to the stock terminal filters. If you did modify your terminal filter configuration, you might want to add this manually:
- New "Suppress wait responses" filter: `Recv: wait`
- [#1344](https://github.com/foosel/OctoPrint/issues/1344) - Fix ProgressBarPlugins to not correctly be triggered for 0% (second try, this time hopefully for good).
- [#1637](https://github.com/foosel/OctoPrint/issues/1637) - Fix issue preventing a folder to be deleted that has a name which is a common prefix of the file currently being printed.
- [#1641](https://github.com/foosel/OctoPrint/issues/1641) - Fix issue with `octoprint --daemon` not working.
- [#1647](https://github.com/foosel/OctoPrint/issues/1647) - Fix issue with `octoprint` command throwing an error if an environment variable `OCTOPRINT_VERSION` was set to its version number.
- [#1648](https://github.com/foosel/OctoPrint/issues/1648) - Added missing `websocket-client` dependency of `octoprint client` to install script.
- [#1653](https://github.com/foosel/OctoPrint/issues/1653) - Fix for an issue with the included init script on the BBB (see also [#1654](https://github.com/foosel/OctoPrint/issues/1654))
- [#1657](https://github.com/foosel/OctoPrint/issues/1657) - Don't care about ordering of common parameters (like `--basedir`, `--config`) on CLI.
- [#1660](https://github.com/foosel/OctoPrint/issues/1660) - Do not show hint regarding keyboard controls beneath webcam stream if keyboard control feature is disabled.
- [#1667](https://github.com/foosel/OctoPrint/issues/1667) - Fix for matching folders not getting listed in the results when performing a search in the file list.
- [#1675](https://github.com/foosel/OctoPrint/issues/1675) - Fix model size calculation in GCODE analysis, produced wrong values in some cases. Also adjusted calculation to match implementation in GCODE viewer, now both produce identical results.
- [#1693](https://github.com/foosel/OctoPrint/issues/1693) - Cura Plugin: Support `perimeter_before_infill` profile setting. Additionally added support for `solidarea_speed`, `raft_airgap_all`, `raft_surface_thickness`, `raft_surface_linewidth` profile settings and adjusted mapping for engine settings `raftAirGapLayer0`, `raftFanSpeed`, `raftSurfaceThickness`and `raftSurfaceLinewidth` according to current mapping in Cura Legacy and adjusted Mach3 GCODE flavor to substitute `S` with `P` in temperature commands of generated start code, also like in Cura Legacy.
- [#1697](https://github.com/foosel/OctoPrint/issues/1697) - Pin Jinja to versions <2.9fornowduetoabackwardscompatibilityissuewithtemplatesforversionsnewerthanthat.Alsopushedasahotfixto1.3.0(as1.3.0post1).
- [#1708](https://github.com/foosel/OctoPrint/issues/1708) - Cura Plugin: Fixed selection of `start.gcode` for sliced file
- Allow a retraction z-hop of 0 in timelapse configuration.
- Fix files in sub folders to not be processed by the initial analysis backlog check during startup of the server.
- Various fixes in the file analysis queue:
- High priority items are now really high priority
- Abort analysis for items that are to be deleted/moved to get around an issue with file access under Windows systems.
- Fix stock terminal filters for suppressing temperature messages and SD status messages to also be able to deal with line number prefixes. If you have added additional terminal filters, you will have to apply this fix manually:
- Changed "Suppress temperature messages" filter: `(Send: (N\d+\s+)?M105)|(Recv: ok (B|T\d*):)`
* You can now create folders in the file list, upload files into said folders and thus better manage your projects' files.
* New wizard dialog for system setups that can also be extended by plugins. Replaces the first run dialog for setting up access control and can also be triggered in other cases than only the first run, e.g. if plugins necessitate user input to function properly. Added wizards to help configuring the following components in OctoPrint on first run: access control, webcam URLs & ffmpeg path, server commands (restart, shutdown, reboot), printer profile. Also extended the bundled Cura plugin to add a wizard for its first setup to adjust path and import a slicing profile, and the bundled Software Update plugin to ask the user for details regarding the OctoPrint update configuration. Also see below.
* New command line interface (CLI). Offers the same functionality as the old one plus:
* a built-in API client (``octoprint client --help``)
* built-in development tools (``octoprint dev --help``)
* extendable through plugins implementing the ``octoprint.cli.commands`` hook (``octoprint plugins --help``)
* New features within the plugin system:
* Plugins may now give hints in which order various hooks or mixin methods should be called by optionally providing an integer value that will be used for sorting the callbacks prior to execution.
* Plugins may now define configuration overlays to be applied on top of the default configuration but before ``config.yaml``.
* OctoPrint will now track the current print head position on pause and cancel and provide it as new template variables ``pause_position``/``cancel_position`` for the relevant GCODE scripts. This will allow more intelligent pause codes that park the print head at a rest position during pause and move it back to the exact position it was before the pause on resume ([Example](https://gist.github.com/foosel/1c09e269b1c0bb7a471c20eef50c8d3e)). Note that this is NOT enabled by default and for now will necessitate adjusting the pause and resume GCODE scripts yourself since position tracking with multiple extruders or when printing from SD is currently not fool proof thanks to firmware limitations regarding reliable tracking of the various ``E`` values and the currently selected tool ``T``. In order to fully implement this feature, the following improvements were also done:
* New ``PositionUpdated`` event when OctoPrint receives a response to an ``M114`` position query.
* Extended ``PrintPaused`` and ``PrintCancelled`` events with position data from ``M114`` position query on print interruption/end.
* Added (optional) firmware auto detection. If enabled (which it is by default), OctoPrint will now send an ``M115`` to the printer on initial connection in order to try to figure out what kind of firmware it is. For FIRMWARE_NAME values containing "repetier" (case insensitive), all Repetier-specific flags will be set on the comm layer. For FIRMWARE_NAME values containing "reprapfirmware" (also case insensitive), all RepRapFirmware-specific flags will be set on the comm layer. For now no other handling will be performed.
* Added safe mode flag ``--safe`` and config setting ``startOnceInSafeMode`` that disables all third party plugins when active. The config setting will automatically be removed from `config.yaml` after the server has started through successfully.
* Added ``octoprint config`` CLI that allows easier manipulation of config.yaml entries from the command line. Example: ``octoprint config set --bool server.startOnceInSafeMode true``
* [#1048](https://github.com/foosel/OctoPrint/issues/1048) - Added "Last print time" to extended file information (see also [#1522](https://github.com/foosel/OctoPrint/pull/1522))
* [#1422](https://github.com/foosel/OctoPrint/issues/1422) - Added option for post roll for timed timelapse to duplicate last frame instead of capturing new frames. That makes for a faster render at the cost of a still frame at the end of the rendered video. See also [#1553](https://github.com/foosel/OctoPrint/pull/1553).
* [#1551](https://github.com/foosel/OctoPrint/issues/1551) - Allow to define a custom bounding box for valid printer head movements in the printer profile, to make print dimension check more flexible.
* [#1583](https://github.com/foosel/OctoPrint/pull/1583) - Strip invalid `pip` arguments from `pip uninstall` commands, if provided by the user as additional pip arguments.
* [#1593](https://github.com/foosel/OctoPrint/issues/1593) - Automatically migrate old manual system commands for restarting OctoPrint and rebooting or shutting down the server to the new system wide configuration settings. Make a backup copy of the old `config.yaml` before doing so in case a manual rollback is required.
* New central configuration option for commands to restart OctoPrint and to restart and shut down the system OctoPrint is running on. This allows plugins (like the Software Update Plugin or the Plugin Manager) and core functionality to perform these common administrative tasks without the user needing to define everything redundantly.
*`pip` helper now adjusts `pip install` parameters corresponding to detected `pip` version:
* Removes `--process-dependency-links` when it's not needed
* Adds `--no-use-wheel` when it's needed
* Detects and reports on completely broken versions
* Better tracking of printer connection state for plugins and scripts:
* Introduced three new Events `Connecting`, `Disconnecting` and `PrinterStateChanged`.
* Introduced new GCODE script `beforePrinterDisconnected` which will get sent before a (controlled) disconnect from the printer. This can be used to send some final commands to the printer before the connection goes down, e.g. `M117 Bye from OctoPrint`.
* The communication layer will now wait for the send queue to be fully processed before disconnecting from the printer for good. This way it is ensured that the `beforePrinterDisconnected` script or any further GCODE injected into it will actually get sent.
* Additional baud rates to allow for connecting can now be specified along side additional serial ports via the settings dialog and the configuration file.
* Option to never send checksums (e.g. if the printer firmware doesn't support it), see [#949](https://github.com/foosel/OctoPrint/issues/949).
* Added secondary temperature polling interval to use when printer is not printing but a target temperature is set - this way the graph should be more responsive while monitoring a manual heatup.
* Test buttons for webcam snapshot & stream URL, ffmpeg path and some other settings (see also [#183](https://github.com/foosel/OctoPrint/issues/183)).
* Temperature graph automatically adjusts its Y axis range if necessary to accomodate the plotted data (see also [#632](https://github.com/foosel/OctoPrint/issues/632)).
* "Fan on" command now always sends `S255` parameter for better compatibility across firmwares.
* Warn users with a notification if a file is selected for printing that exceeds the current print volume (if the corresponding model data is available, see also [#1254](https://github.com/foosel/OctoPrint/pull/1254))
* Added option to also display temperatures in Fahrenheit (see also [#1258] (https://github.com/foosel/OctoPrint/pull/1258))
* Better error message when the ``config.yaml`` file is invalid during startup
* API now also allows issuing absolute jogging commands to the printer
* Printer profile editor dialog refactored to better structure fields and explain where they are used
* Option to detect z-hops during z-based timelapses and not trigger a snapshot (see also [1148](https://github.com/foosel/OctoPrint/pull/1148))
* File rename, move and copy functionality exposed via API, not yet utilized in stock frontend but available in [file manager plugin](https://github.com/Salandora/OctoPrint-FileManager).
* Try to assure a sound SSL environment for the process at all times
* Improved caching:
* Main page and asset files now carry proper ``ETag`` and ``Last-Modified`` headers to allow for sensible browser-side caching
* API sets ``Etag`` and/or ``Last-Modified`` headers on responses to GET requests where possible and feasible to allow for sensible browser-side caching
* Renamed ``GcodeFilesViewModel`` to ``FilesViewModel`` - plugin authors should accordingly update their dependencies from ``gcodeFilesViewModel`` to ``filesViewModel``. Using the old name still works, but will log a warning and stop working with 1.4.x.
* Make sure ``volume.depth`` for circular beds is forced to ``volume.width`` in printer profiles
* Plugin Manager: Allow closing of all notifications and close them automatically on detected server disconnect. No need to keep a "Restart needed" message around if a restart is in progress.
* Software Update plugin: More verbose output for logged in administrators. Will now log the update commands and their output similar to the Plugin Manager install and uninstall dialog.
* Software Update plugin: CLI for checking for and applying updates
* Software Update plugin: "busy" spinner on check buttons while already checking for updates.
* Software Update plugin: Prevent update notification when wizard is open.
* Plugin Manager / Software Update plugin: The "There's a new version of pip" message during plugin installs and software updates is no longer displayed like an error.
* Plugin Manager / Software Update plugin: The "busy" dialog can no longer be closed accidentally.
* Timelapse: Better (& earlier) reporting to the user when something's up with the snapshot URL causing issues with capturing timelapse frames and hence making it impossible to render a timelapse movie on print completion.
* Various improvements in the GCODE interpreter which performs the GCODE analysis
* Various adjustments towards Python 3 compatibility (still a work in progress though, see also [#1411](https://github.com/foosel/OctoPrint/pull/1411), [#1412](https://github.com/foosel/OctoPrint/pull/1412), [#1413](https://github.com/foosel/OctoPrint/pull/1413), [#1414](https://github.com/foosel/OctoPrint/pull/1414))
* [#1148](https://github.com/foosel/OctoPrint/issues/1148) - Fixed retraction z hop setting for Z-triggered timelapses. Was not correctly propagated to the backend and hence not taking effect.
* [#1567](https://github.com/foosel/OctoPrint/issues/1567) - Invalidate ``/api/settings`` cache on change of the user's login state (include user roles into ETag calculation).
* [#1586](https://github.com/foosel/OctoPrint/issues/1586) - Fixed incompatibility of update script and command line helper with non-ASCII output from called commands.
* Invalidate ``/api/settings`` cache on change of the currently enabled plugins (by including plugin names into ETag calculation) and/or on change of the current effective config.
* Fix for `/api/settings` not being properly invalidated for plugin settings that do not have a representation in `config.yaml` but are only added at runtime (and hence are not captured by `config.effective`).
* Invalidate ``/api/timelapse`` cache on change of the current timelapse configuration.
* Fixed an issue causing the version number not to be properly extracted from ``sdist`` tarballs generated under Windows.
* Get rid of double scroll bar in printer profile editor.
* Fixed tracking of current byte position in file being streamed from disk. Turns out that ``self._handle.tell`` lied to us thanks to line buffering.
* Fixed select & print not working anymore for SD files thanks to a timing issue.
* Fixed ``PrintFailed`` event payload (was still missing new folder relevant data).
* Fixed premature parse stop on ``M114`` and ``M115`` responses with ``ok``-prefix.
* Make sure `?l10n` request parameter gets also propagated to API calls as `X-Locale` header in case of locale sensitive API responses.
* Fix language mixture due to cached template configs including localized strings; cache per locale.
* Only insert divider in system menu after core commands if there are custom commands.
* Fix update of webcam stream URL not being applied due to caching.
* Fixed a rare race condition causing the new "The settings changed, reload?" popup to show up even when the settings change originated in the same client instance.
* Fixed a bunch of missing translations.
* Pinned Tornado version to 4.0.2. Former version requirement was able to pull in a beta version causing issues with websockets due to a bug in `permessage-deflate` handling. The Tornado requirement needs an update, but we'll leave it at 4.0.2 for 1.3.0 since we'll need to do some migration work for compatibility with anything newer. Potentially related to [#1523](https://github.com/foosel/OctoPrint/issues/1523).
* Fix a rare race condition in the command line helper and the update script that could cause the code to hang due to waiting on an event that would never be set.
* Fix issue with handling new settings substructures when they are compared to existing settings data in order to find the structural diff.
* Fix for the temperature graph not displaying the data history on site reload.
* Allow arbitrary frame rates for creating timelapses. Before, the entered fps value was also directly used as frame rate for the actual video, which could cause problems with any frame rates not specified in the MPEG2 standard. Now OctoPrint will use a standard frame rate for the rendered video and render the timelapse stills into the finished movie with the configured frame rate.
* Limited Cura profile importer to `.ini` files and clarified the supported versions
* Add support for the `R` parameter for `M109` and `M190`
### Bug fixes
* [#1541](https://github.com/foosel/OctoPrint/issues/1541) - Fix selecting the printer profile to use by default
* [#1543](https://github.com/foosel/OctoPrint/issues/1543) - Fix target temperature propagation from communication layer
* [#1567](https://github.com/foosel/OctoPrint/issues/1567) - Fix issue with restricted settings getting parsed to the wrong data structure in the frontend if loaded anonymously first.
* [#1571](https://github.com/foosel/OctoPrint/issues/1571) - Fix parsing of port number from HTTP Host header for IPv6 addresses
* Fix issue with settings restriction causing internal settings defaults to be changed.
* Files like `config.yaml` etc will now persist their permissions, with a lower and upper permission bounds for sanitization (e.g. removing executable flags on configuration files but keeping group read/write permissions if found).
* Log full stack trace on socket connection errors when debug logging for `octoprint.server.util.sockjs` is enabled
* ``SettingsPlugin``s may now mark configuration paths as restricted so that they are not returned on the REST API
* Improved the `serial.log` logging handler to roll over serial log on new connections to the printer instead of continuously appending to the same file. Please note that `serial.log` is a debugging tool only and should *not* be left enabled unless you are trying to troubleshoot something in your printer communication.
* Split JS/CSS/LESS asset bundles according into asset bundles for core + bundled plugins ("packed_core.{js|css|less}") and third party plugins ("packed_plugins.{js|css|less}"). That will allow the core UI to still function properly even if an installed third party plugin produces invalid JS and therefore causes a parser error for the whole plugin JS file. See [#1544](https://github.com/foosel/OctoPrint/issues/1544) for an example of such a situation.
* [#1531](https://github.com/foosel/OctoPrint/issues/1531) - Fixed encoding bug in HTTP request processing triggered by content type headers on form data fields
* Fixed forced `config.yaml` save on startup caused by mistakenly assuming that printer parameters were always migrated.
* Fixed issue causing ``remember_me`` cookie not to be deleted properly on logout
* Fixed broken filter toggling on ``ItemListHelper`` class used for various lists throughout the web interface
* Fixed an issue with the preliminary page never reporting that the server is now up if the page generated during preliminary caching had no cache headers set (e.g. because it contained the first run setup wizard)
* Fixed a bug causing the update of OctoPrint to not work under certain circumstances: If 1.2.16 was installed and the settings were *never* saved via the "Settings" dialog's "Save", the update of OctoPrint would fail due to a `KeyError` in the updater. Reason is a renamed property, properly switched to when saving the settings.
* Fixed the logging subsystem to properly clean up after itself.
* Fixed a wrong order in loading JS files on the client introduced in 1.2.17rc2 to make the UI more resilient against broken plugin JS.
* Properly handle empty JS file list from plugins. Solves a 500 on OctoPrint instances without any third party plugins installed generated during web asset bundling introduced in 1.2.17rc2.
* [#1434](https://github.com/foosel/OctoPrint/issues/1434): Make sure to sanitize any file names in the upload folder that do not match OctoPrint's file name "sanitization standard" automatically when creating a file listing. This should solve issues with UI functionality like selecting a file for printing or deleting a file to not work with files that were uploaded manually to the ``uploads`` folder. As a side note: Please don't do this, use the ``watched`` folder if you want to SCP/FTP/copy files directly to OctoPrint.
* [#1434](https://github.com/foosel/OctoPrint/issues/1434): Allow `[` and `]` in uploaded file names.
* [#1481](https://github.com/foosel/OctoPrint/issues/1481): Bring back non-fuzzy layer time estimates in the GCODE viewer.
* Improved fuzzy print time displays in the frontend. Rounding now takes overall duration into account - durations over a day will be rounded up/down to half days, durations over an hour will be rounded up/down to half hours, durations over 30min will be rounded to 10min segments, durations below 30min will be rounded up or down to the next minute depending on the seconds and finally if we are talking about less than a minute, durations over 30s will return "less than a minute", durations under 30s will return "a couple of seconds".
* Improved intermediary loading page: Don't report server as ready and reload until preliminary caching has been done, IF preliminary caching will be done.
* Added release channels to OctoPrint's bundled Software Update plugin. You will now be able to subscribe to OctoPrint's `maintenance` or `devel` release candidates in addition to stable versions. [Read more about Release Channels on the wiki](https://github.com/foosel/OctoPrint/wiki/Using-Release-Channels).
* Return a "400 Bad Request" instead of a "500 Internal Server Error" if a `multipart/form-data` request (e.g. a file upload) is sent which lacks the `boundary` field.
* [#1448](https://github.com/foosel/OctoPrint/issues/1448): Don't "eat" first line of the pause script after a pause triggering `M0` but send it to the printer instead
* [#1477](https://github.com/foosel/OctoPrint/issues/1477): Only report files enqueued for analysis which actually are (as in, don't claim to have queued STL files for GCODE analysis)
* [#1478](https://github.com/foosel/OctoPrint/issues/1478): Don't display inaccurate linear estimate ("6 days remaining") until 30 *minutes* have passed, even if nothing else is available. Potentially related to [#1428](https://github.com/foosel/OctoPrint/issues/1428).
* [#1479](https://github.com/foosel/OctoPrint/issues/1479): Make sure set cookies are post fixed with a port specific suffix and that the path they are set on takes the script root from the request into account.
* [#1483](https://github.com/foosel/OctoPrint/issues/1483): Filenames in file uploads may also now be encoded in ISO-8859-1, as defined in [RFC 7230](https://tools.ietf.org/html/rfc7230#section-3.2.4). Solves an issue when sending files with non-ASCII-characters in the file name from Slic3r.
* [#1491](https://github.com/foosel/OctoPrint/issues/1491): Fixed generate/delete API key in the user settings
* [#1492](https://github.com/foosel/OctoPrint/issues/1492): Fixed a bug in the software update plugin depending on the presence of the ``prerelease`` flag which is only present when added manually or using a non stable release channel.
* [#1425](https://github.com/foosel/OctoPrint/issues/1425) - Added a compatibility work around for plugins implementing the [`octoprint.comm.transport.serial_factory` hook](http://docs.octoprint.org/en/master/plugins/hooks.html#octoprint-comm-transport-serial-factory) but whose handler's `write` method did not return the number of written bytes (e.g. [GPX plugin including v2.5.2](http://plugins.octoprint.org/plugins/gpx/), [M33 Fio plugin including v1.2](http://plugins.octoprint.org/plugins/m33fio/)).
### Bug Fixes
* [#1423](https://github.com/foosel/OctoPrint/issues/1423) - Fixed an issue with certain printers dropping or garbling communication when setting the read timeout of the serial line. Removed the dynamic timeout setting introduced by [#1409](https://github.com/foosel/OctoPrint/issues/1409) to solve this.
* [#1425](https://github.com/foosel/OctoPrint/issues/1425) - Fixed an error when trying to close a printer connection that had not yet been opened and was `None`
* Fixed "Last Modified" header calculation for views where only one source file was present
* [#935](https://github.com/foosel/OctoPrint/issues/935) - Support alternative source file types and target extensions in [SlicerPlugins](http://docs.octoprint.org/en/master/plugins/mixins.html#slicerplugin).
* [#1393](https://github.com/foosel/OctoPrint/issues/1393) - Added dedicated sub commands on the job API to pause and resume a print job (instead of only offering a toggle option).
* Better "upload error" message with a list of supported extensions (instead of hardcoded ones)
* Use fuzzy times for print time estimation from GCODE analysis
* Allow M23 "File opened" response with no filename (RepRapPro)
* Allow intermediary startup page to forward query parameters and fragments from initial call to actual web frontend
* More error resilience when rendering templates (e.g. from plugins)
* Make sure that all bytes of a line to send to the printer have actually been sent
* "Tickle" printer when encountering a communication timeout while idle
* Report `CLOSED`/`CLOSED_WITH_ERROR` states as "Offline" in frontend for more consistency with startup `NONE` state which already was reported as "Offline"
* Another attempt at a saner print time estimation: Force linear (way less accurate) estimate if calculation of more accurate version takes too long, sanity check calculated estimate and use linear estimate if it looks wrong, improved threshold values for calculation. Read [the second half of this post on the mailing list](https://groups.google.com/forum/#!msg/octoprint/WWpm1FCUkAs/X3HomTM5DgAJ) on why accurate print time estimation is so difficult to achieve.
* Display print job progress percentage on progress bar.
* Added an indicator for print time left prediction accuracy and explanation of its origin as tooltip.
* Improved visual distinction of "State" sidebar panel info clusters.
### Bug Fixes
* [#1385](https://github.com/foosel/OctoPrint/issues/1385) - Send all non-protocol messages from printer to clients.
* [#1388](https://github.com/foosel/OctoPrint/issues/1388) - Track consecutive timeouts even when idle and disconnect from printer when it's not responding any longer.
* [#1391](https://github.com/foosel/OctoPrint/issues/1391) - Only use the first value from the X-Scheme header for the reverse proxy setup. Otherwise there could be problems when multiple reverse proxies were configured chained together, each adding their own header to the mix.
* [#1407](https://github.com/foosel/OctoPrint/issues/1407) - If a file is uploaded with the "print" flag set to true, make sure to clear that flag after the print job has been triggered so that now all following uploaded or selected files will start printing on their own.
* [#1409](https://github.com/foosel/OctoPrint/issues/1409) - Don't report a communication timeout after a heatup triggered by a print from SD.
* Fixed scrolling to freshly uploaded files, also now highlighting the file entry for better visibility.
* Fixed overeager preemptive caching of invalid protocols.
* Fix modal background of update confirmation not vanishing
* Ensure log entries and messages from printer are sent to frontend already converted to utf-8. Otherwise even one line in the log that can't be converted automatically without error can cause updates from the backend to not arrive.
* Report correct printer state including error strings even after disconnecting
* While printing, be sure to read the next line from file and send that if the current line was filtered
* [#1373](https://github.com/foosel/OctoPrint/issues/1373): Don't parse `B:` as bed temperature when it shows up as part of a position report from `M114`.
* [#1374](https://github.com/foosel/OctoPrint/issues/1374): Don't try to perform a passive login when the components we'd need to inform about a change in login state aren't yet available. Solves a bug that lead - among other things - to the Plugin Manager and the Software Update Plugin not showing anything but misleading errors until the user logged out and back in.
* [#1338](https://github.com/foosel/OctoPrint/issues/1338): Threshold configuration fields now include information about how to specify the thresholds.
* Mark unrendered timelapses currently being processed (recording or rendering) in the list and remove action buttons so no accidental double-processing can take place.
* Removed file extension from "rendering" and "rendered" notifications, was misleading when using the [mp4 wrapper script](https://github.com/guysoft/OctoPi/issues/184).
* Added some new events for manipulation of slicing profiles.
* Small fix of the german translation.
### Bug Fixes
* [#1314](https://github.com/foosel/OctoPrint/issues/1314): Do not change the extension of `.g` files being uploaded to SD (e.g. `auto0.g`)
* [#1320](https://github.com/foosel/OctoPrint/issues/1320): Allow deletion of *.mp4 timelapse files (see [this wrapper script](https://github.com/guysoft/OctoPi/issues/184)).
* [#1324](https://github.com/foosel/OctoPrint/issues/1324): Make daemonized OctoPrint properly clean up its pid file again (see also [#1330](https://github.com/foosel/OctoPrint/pull/1330)).
* [#1326](https://github.com/foosel/OctoPrint/issues/1326): Do not try to clean up an unrendered timelapse while it is already being deleted (and produce way too much logging output in the process).
* [#1343](https://github.com/foosel/OctoPrint/issues/1343): Events are now processed in the order they are fired in, making e.g. the "timelapse rendering" message always appear before "timelapse failed" and hence not stay on forever in case of a failed timelapse.
* [#1344](https://github.com/foosel/OctoPrint/issues/1344): `ProgressPlugin`s now get also notified about a progress of 0%.
* [#1357](https://github.com/foosel/OctoPrint/issues/1357): Fixed wrongly named method call on editing access control options for a user, causing that to not work properly.
* [#1361](https://github.com/foosel/OctoPrint/issues/1361): Properly reload profile list for currently selected slicer in the slicing dialog on change of profiles.
* [#1364](https://github.com/foosel/OctoPrint/issues/1364): Fixed a race condition that could cause the UI to not initialize correctly due to 401 errors, leaving it in an unusable state until a reload.
* Fixed concurrent message pushing to the frontend being able to break push messages for the session by forcing synchronization of SockJS message sending.
* Do not require admin rights for connecting/disconnecting, like it was in 1.1.x (note that this is supposed to become configurable behaviour once [#1110](https://github.com/foosel/OctoPrint/issues/1110) gets implemented)
Due to a recent change in the financial situation of the project, the funding of OctoPrint is at stake. If you love OctoPrint and want to see its development continue at the pace of the past two years, please read on about its current funding situation and how you can help: ["I need your support"](http://octoprint.org/blog/2016/04/13/i-need-your-support/).
### Improvements
* Added option to treat resend requests as `ok` for such firmwares that do not send an `ok` after requesting a resend. If you printer communication gets stalled after a resend request from the firmware, try checking this option.
* Added an "About" dialog to properly inform about OctoPrint's license, contributors and supporters.
* Added a announcement plugin that utilizes the RSS feeds of the [OctoPrint Blog](http://octoprint.org/blog/) and the [plugin repository](http://plugins.octoprint.org) to display news to the user. By default only the "important announcement" category is enabled. This category will only be used for very rare situations such as making you aware of critical updates or important news. You can enable further categories (with more announcements to be expected) in the plugin's settings dialog.
### Bug Fixes
* [#1300](https://github.com/foosel/OctoPrint/issues/1300) - Removed possibility to accidentally disabling local file list by first limiting view to files from SD and then disabling SD support.
* [#1315](https://github.com/foosel/OctoPrint/issues/1315) - Fixed broken post roll on z-based timelapses.
* Fixed CSS data binding syntax on the download link in the files list
* Changed control distance from jQuery data into a knockout observerable and observerableArray
* Allow an unauthorized user to logout from a logedin interface state
* Improved performance of console output during plugin installation/deinstallation
* Slight performance improvements in the communication layer
* Log small log excerpt to `octoprint.log` upon encountering a communication error.
* Changed wording in "firmware error" notifications to better reflect that there was an error while communicating with the printer, since the error condition can also be triggered by serial errors while trying to establish a connection to the printer or when already connected.
* Support downloading ".mp4" timelapse files. You'll need a [custom wrapper script for timelapse rendering](https://github.com/guysoft/OctoPi/issues/184) for this to be relevant to you. See also [#1255](https://github.com/foosel/OctoPrint/pull/1255)
* The communication layer will now wait up to 10s after clicking disconnect in order to send any left-over lines from its buffers.
* Moved less commonly used configuration options in Serial settings into "Advanced options" roll-out.
### Bug Fixes
* [#1224](https://github.com/foosel/OctoPrint/issues/1224) - Fixed an issue introduced by the fix for [#1196](https://github.com/foosel/OctoPrint/issues/1196) that had the "Upload to SD" button stop working correctly.
* [#1226](https://github.com/foosel/OctoPrint/issues/1226) - Fixed an issue causing an error on disconnect after or cancelling of an SD print, caused by the unsuccessful attempt to record print recovery data for the file on the printer's SD card.
* [#1268](https://github.com/foosel/OctoPrint/issues/1268) - Only add bed temperature line to temperature management specific start gcode in CuraEngine invocation if a bed temperature is actually set in the slicing profile.
* [#1271](https://github.com/foosel/OctoPrint/issues/1271) - If a communication timeout occurs during an active resend request, OctoPrint will now not send an `M105` with an increased line number anymore but repeat the last resent command instead.
* [#1272](https://github.com/foosel/OctoPrint/issues/1272) - Don't add an extra `ok` for `M28` response.
* [#1273](https://github.com/foosel/OctoPrint/issues/1273) - Add an extra `ok` for `M29` response, but only if configured such in "Settings" > "Serial" > "Advanced options" > "Generate additional ok for M29"
* [#1274](https://github.com/foosel/OctoPrint/issues/1274) - Trigger `M20` only once after finishing uploading to SD
* [#1275](https://github.com/foosel/OctoPrint/issues/1275) - Prevent `M105` "cascade" due to communication timeouts
* Fixed wrong tracking of extruder heating up for `M109 Tn` commands in multi-extruder setups.
* Fixed start of SD file uploads not sending an `M110`.
* Fixed job data not being reset when disconnecting while printing.
* [#318](https://github.com/foosel/OctoPrint/issues/318) - Snapshots for timelapses are now named in a non-colliding, job-based way, allowing a new timelapse to start while the other is still being rendered (although printing with an active timelapse rendering job is not recommended and will be solved with a proper render job queue in a later version). Timelapses that were not successfully rendered are kept for 7 days (configurable, although not via the UI so far) and can be manually rendered or deleted through a new UI component within the timelapse tab that shows up if unrendered timelapses are detected.
* [#485](https://github.com/foosel/OctoPrint/issues/485) - "Timelapse rendering" notification is now persistent, even across reloads/client switches. That should make it easier to see that a rendering job is currently in progress.
* [#939](https://github.com/foosel/OctoPrint/issues/939) - Updated to Knockout 3.4.0
* [#1204](https://github.com/foosel/OctoPrint/issues/1204) - Display total print time as estimated by GCODE viewer on GCODE viewer tab. That will allow access to an estimate even if the server hadn't yet calculated that when a print started. Note that due to slightly different implementation server and client side the resulting estimate might differ.
* OctoPrint now serves an intermediary page upon start that informs the user about the server still starting up. Once the server is detected as running, the page automatically switches to the standard interface.
* OctoPrint now displays a link to the release notes of an updated component in the update notification, the update confirmation and the version overview in the settings dialog. Please always make sure to at least skim over the release notes for new OctoPrint releases, they might contain important information that you need to know before updating.
* Improved initial page loading speeds by introducing a preemptive cache. OctoPrint will now record how you access it and on server start pre-render the page so it's ideally available in the server-side cache when you try to access it.
* Initialize login user name and password with an empty string and clear both on successful login (see [#1175](https://github.com/foosel/OctoPrint/pull/1175)).
* Added a "Refresh" button to the file list for people who modify the stored files externally (doing this is not encouraged however due to reasons of book keeping, e.g. metadata tracking etc).
* "Save" button on settings dialog is now disabled while background tasks (getting or receiving config data from the backend) are in progress.
* Improved performance of terminal tab on lower powered clients. Adaptive rate limiting now ensures the server backs off with log updates if the client can't process them fast enough. If the client is really slow, log updates get disabled automatically during printing. This behaviour can be disabled with override buttons in the terminal tab's advanced options if necessary.
* Added option to ignore any unhandled errors reported by the firmware and another option to only cancel ongoing prints on unhandled errors from the firmware (instead of instant disconnect that so far was the default).
* Made version compatibility check PEP440 compliant (important for plugin authors).
* Do not hiccup on manually sent `M28` commands.
* Persist print recovery data on print failures (origin and name of printed file, position in file when print was aborted, time and date of print failure). Currently this data isn't used anywhere, but it [can be accessed from plugins in order to add recovery functionality](https://github.com/foosel/OctoPrint-PrintRecoveryPoc) to OctoPrint.
* Small performance improvements in update checks.
* The file upload dialog will now only display files having an extension that's supported for upload (if the browser supports it, also see [#1196](https://github.com/foosel/OctoPrint/issues/1196)).
### Bug Fixes
* [#1007](https://github.com/foosel/OctoPrint/issues/1007) - Don't enable the "Print" button if no print job is selected.
* [#1181](https://github.com/foosel/OctoPrint/issues/1181) - Properly slugify UTF-8 only file names.
* [#1196](https://github.com/foosel/OctoPrint/issues/1196) - Do not show drag-n-drop overlay if server is offline.
* [#1208](https://github.com/foosel/OctoPrint/issues/1208) - Fixed `retraction_combing` profile setting being incorrectly used by bundled Cura plugin (see [#1209](https://github.com/foosel/OctoPrint/pull/1209))
* Fixed OctoPrint compatibility check in the plugin manager, could report `False` for development versions against certain versions of Python's `setuptools` (thanks to @ignaworm who stumbled over this).
* Fixed a missing parameter in `PluginSettings.remove` call (see [#1177](https://github.com/foosel/OctoPrint/pull/1177)).
* Docs: Fixed the example for a custom `M114` control to also match negative coordinates.
* Reset scroll position in settings dialog properly when re-opening it or switching tabs.
* Fixed an issue that prevented system menu entries that were added to a so far empty system menu make the menu show up.
* Fixed an issue that made requests to restricted resources fail even though the first run wizard had been completed successfully.
* Fixed an issue where an unknown command or the suppression of a command could cause the communication to stall until a communication timeout was triggered.
* Strip [unwanted ANSI characters](https://github.com/pypa/pip/issues/3418) from output produced by pip versions 8.0.0, 8.0.1 and 8.0.3 that prevents our plugin installation detection from working correctly.
For more information please refer to the [Important information for people updating from version 1.2.7](#important-information-for-people-updating-from-version-127)
* New option to actively poll the watched folder. This should make it work also
if it is mounted on a filesystem that doesn't allow getting notifications
about added files through notification by the operating system (e.g.
network shares).
* Better resilience against senseless temperature/SD-status-polling intervals
(such as 0).
* Log exceptions during writing to the serial port to `octoprint.log`.
### Bug Fixes
* [#961](https://github.com/foosel/OctoPrint/pull/961) - Fixed a JavaScript error that caused an error to be logged when "enter" was pressed in file or plugin search.
* [#962](https://github.com/foosel/OctoPrint/pull/962) - ``url(...)``s in packed CSS and LESS files should now be rewritten properly too to refer to correct paths
* Update notifications were not vanishing properly after updating:
* Only use version cache for update notifications if the OctoPrint version still is the same to make sure the cache gets invalidated after an external update of OctoPrint.
* Do not persist version information when saving settings of the Software Update plugin
* Always delete files from the ``watched`` folder after importing then. Using file preprocessor plugins could lead to the files staying there.
* Fixed an encoding problem causing OctoPrint's Plugin Manager and Software Update plugins to choke on UTF-8 characters in the update output.
* Fixed sorting by file size in file list
* More resilience against missing plugin assets:
* Asset existence will now be checked before they get included
in the assets to bundle by webassets, logging a warning if a
file isn't present.
* Monkey-patched webassets filter chain to not die when a file
doesn't exist, but to log an error instead and just return
[the requirement specification format of the `pkg_resources` package](https://pythonhosted.org/setuptools/pkg_resources.html#requirements-parsing).
* Only print the commands of configured event handlers to the log when a new `debug` flag is present in the config
(see [the docs](http://docs.octoprint.org/en/master/configuration/config_yaml.html#events)). Reduces risk of disclosing sensitive data when sharing log files.
* Added internationalization of UI. Translations of OctoPrint are being crowd sourced via [Transifex](https://www.transifex.com/projects/p/octoprint/).
update notification and application process through a new hook ["octoprint.plugin.softwareupdate.check_config"](https://github.com/foosel/OctoPrint/wiki/Plugin:-Software-Update#octoprintpluginsoftwareupdatecheck_config).
* System commands now be set to a) run asynchronized by setting their `async` property to `true` and b) to ignore their
result by setting their `ignore` property to `true`.
* Various improvements of newly introduced features over the course of development:
* File management: The new implementation will migrate metadata from the old one upon first startup after upgrade from
version 1.1.x to 1.2.x. That should speed up initial startup.
* File management: GCODE Analysis backlog processing has been throttled to not take up too many resources on system
startup. Freshly uploaded files should still be analyzed at full speed.
* Plugins: SettingsPlugins may track versions of configuration format stored in `config.yaml`, including a custom
migration method getting called when a mismatch between the currently stored configuration format version and the one
reported by the plugin as current is detected.
* Plugins: Plugins may now have a folder for plugin related data whose path can be retrieved from the plugin itself
via its new method [`get_plugin_data_folder`](http://docs.octoprint.org/en/master/modules/plugin.html#octoprint.plugin.types.OctoPrintPlugin.get_plugin_data_folder).
* Plugin Manager: Don't allow plugin management actions (like installing/uninstalling or enabling/disabling) while the
printer is printing (see also unreproduced issue [#936](https://github.com/foosel/OctoPrint/issues/936)).
* Plugin Manager: More options to try to match up installed plugin packages with discovered plugins.
* Plugin Manager: Display a more friendly message if after the installation of a plugin it could not be correctly
identifier.
* Software Update: Enforce refreshing of available updates after any changes in enabled plugins.
- [#344](https://github.com/foosel/OctoPrint/issues/344) - Made timelapses capable of coping with missing captures in between by decrementing the image counter again if there
was an error fetching the latest image from the snapshot URL (backport of [1a7a468](https://github.com/foosel/OctoPrint/commit/1a7a468eb65fdf2a13b4c7a7723280e822c9c34b)
and [bf9d5ef](https://github.com/foosel/OctoPrint/commit/bf9d5efe43a1e57aacd8512125082ddca06b4efc))
- [#693](https://github.com/foosel/OctoPrint/issues/693) - Try not to capture an image if image counter is still unset
- [unreported] Synchronize image counter decrementing as well as incrementing to prevent rare race conditions when generating the
viewport gets manipulated by the user ([#398](https://github.com/foosel/OctoPrint/issues/398))
* GCODE viewer now interprets inverted axes for printer control and mirrors print bed accordingly ([#431](https://github.com/foosel/OctoPrint/issues/431))
* Added `clean` command to `setup.py`, removes old build artifacts (mostly interesting for developers)
* Added version resource on API which reports application and API version
* Made the navbar static instead of fixed to improve usability on mobile devices ([#257](https://github.com/foosel/OctoPrint/issues/257))
* Switch to password field upon enter in username field, submit login form upon enter in password field
* Changed default path to OctoPrint executable in included init-script to `/usr/local/bin/octoprint` (the default when
installing via `python setup.py install`)
### Bug Fixes
* Properly calculate time deltas (forgot to factor in days)
* [#35](https://github.com/foosel/OctoPrint/issues/35) - GCODE viewer has been modularized, options are now functional
* [#337](https://github.com/foosel/OctoPrint/issues/337) - Also recognize `--iknowwhatimdoing` when running as daemon
* [#357](https://github.com/foosel/OctoPrint/issues/357) - Do not run GCODE analyzer when a print is ongoing
* [#381](https://github.com/foosel/OctoPrint/issues/381) - Only list those SD files that have an ASCII filename
* Fixed a race condition that could occur when pressing "Print" (File not opened yet, but attempt to read from it)
* [#398](https://github.com/foosel/OctoPrint/issues/398) - Fixed interfering options in GCODE viewer
