diff --git a/src/octoprint/printer/standard.py b/src/octoprint/printer/standard.py
index 1976b750..7a619c45 100644
--- a/src/octoprint/printer/standard.py
+++ b/src/octoprint/printer/standard.py
@@ -595,12 +595,16 @@ class Printer(PrinterInterface, comm.MachineComPrintCallback):
 		self.refresh_sd_files(blocking=True)
 		existingSdFiles = map(lambda x: x[0], self._comm.getSdFiles())
 
-		remoteName = util.get_dos_filename(filename,
-		                                   existing_filenames=existingSdFiles,
-		                                   extension="gco",
-		                                   whitelisted_extensions=["gco", "g"])
+		if valid_file_type(filename, "gcode"):
+			remoteName = util.get_dos_filename(filename,
+			                                   existing_filenames=existingSdFiles,
+			                                   extension="gco",
+			                                   whitelisted_extensions=["gco", "g"])
+		else:
+			# probably something else added through a plugin, use it's basename as-is
+			remoteName = os.path.basename(filename)
 		self._timeEstimationData = TimeEstimationHelper()
-		self._comm.startFileTransfer(absolutePath, filename, "/" + remoteName)
+		self._comm.startFileTransfer(absolutePath, filename, "/" + remoteName, special=not valid_file_type(filename, "gcode"))
 
 		return remoteName
 
diff --git a/src/octoprint/util/comm.py b/src/octoprint/util/comm.py
index 44a6605a..425b54d8 100644
--- a/src/octoprint/util/comm.py
+++ b/src/octoprint/util/comm.py
@@ -877,7 +877,7 @@ class MachineCom(object):
 			self._changeState(self.STATE_ERROR)
 			eventManager().fire(Events.ERROR, {"error": self.getErrorString()})
 
-	def startFileTransfer(self, filename, localFilename, remoteFilename):
+	def startFileTransfer(self, filename, localFilename, remoteFilename, special=False):
 		if not self.isOperational() or self.isBusy():
 			self._logger.info("Printer is not operational or busy")
 			return
@@ -885,7 +885,10 @@ class MachineCom(object):
 		with self._jobLock:
 			self.resetLineNumbers()
 
-			self._currentFile = StreamingGcodeFileInformation(filename, localFilename, remoteFilename)
+			if special:
+				self._currentFile = SpecialStreamingGcodeFileInformation(filename, localFilename, remoteFilename)
+			else:
+				self._currentFile = StreamingGcodeFileInformation(filename, localFilename, remoteFilename)
 			self._currentFile.start()
 
 			self.sendCommand("M28 %s" % remoteFilename)
@@ -2356,7 +2359,7 @@ class MachineCom(object):
 						# now comes the part where we increase line numbers and send stuff - no turning back now
 						command_requiring_checksum = gcode is not None and gcode in self._checksum_requiring_commands
 						command_allowing_checksum = gcode is not None or self._sendChecksumWithUnknownCommands
-						checksum_enabled = not self._neverSendChecksum and (self.isPrinting() or
+						checksum_enabled = not self._neverSendChecksum and ((self.isPrinting() and self._currentFile and self._currentFile.checksum) or
 						                                                    self._alwaysSendChecksum or
 						                                                    not self._firmware_info_received)
 
@@ -2825,6 +2828,8 @@ class PrintingFileInformation(object):
 	value between 0 and 1.
 	"""
 
+	checksum = True
+
 	def __init__(self, filename):
 		self._logger = logging.getLogger(__name__)
 		self._filename = filename
@@ -2879,6 +2884,8 @@ class PrintingSdFileInformation(PrintingFileInformation):
 	Encapsulates information regarding an ongoing print from SD.
 	"""
 
+	checksum = False
+
 	def __init__(self, filename, size):
 		PrintingFileInformation.__init__(self, filename)
 		self._size = size
@@ -3025,6 +3032,23 @@ class StreamingGcodeFileInformation(PrintingGcodeFileInformation):
 		self._logger.info("Finished in {duration:.3f} s. Approx. transfer rate of {rate:.3f} lines/s or {time_per_line:.3f} ms per line".format(**stats))
 
 
+class SpecialStreamingGcodeFileInformation(StreamingGcodeFileInformation):
+	"""
+	For streaming files to the printer that aren't GCODE.
+
+	Difference to regular StreamingGcodeFileInformation: no checksum requirement, only rudimentary line processing
+	(stripping of whitespace from the end and ignoring of empty lines)
+	"""
+
+	checksum = False
+
+	def _process(self, line, offsets, current_tool):
+		line = line.rstrip()
+		if not len(line):
+			return None
+		return line
+
+
 class SendQueue(PrependableQueue):
 
 	def __init__(self, maxsize=0):