The API now allows to specify where on the print bed to put the sliced model's center

docs/api/fileops.rst

@@ -311,6 +311,9 @@ Issue a file command
      * ``slicer``: The slicing engine to use, defaults to ``cura`` if not set, which is also the only supported slicer right now.
      * ``gcode``: Name of the GCODE file to generated, in the same location as the STL file. Defaults to the STL file name
        with extension ``.gco`` if not set.
+     * ``position``: Position of the object-to-slice's center on the print bed. A dictionary containing both ``x`` and ``y``
+       coordinate in mm is expected
+     * ``printerProfile``: Name of the printer profile to use, if not set the default printer profile will be used.
      * ``profile``: Name of the slicing profile to use, if not set the default slicing profile of the slicer will be used.
      * ``profile.*``: Override parameters, the ``profile.`` prefix will be stripped and the matching profile key will
        be overridden with the supplied value. Use this if you want to specify things that change often like a different
@@ -352,9 +355,11 @@ Issue a file command
         "command": "slice",
         "slicer": "cura",
         "gcode": "some_model.first_try.gcode",
+        "printerProfile": "my_custom_reprap",
         "profile": "high_quality",
         "profile.infill": 75,
-        "profile.fill_density": 15
+        "profile.fill_density": 15,
+        "position": {"x": 100, "y": 100}
       }
 
    .. sourcecode:: http

src/octoprint/filemanager/__init__.py

@@ -152,7 +152,7 @@ class FileManager(object):
 	def default_slicer(self):
 		return self._slicing_manager.default_slicer
 
-	def slice(self, slicer_name, source_location, source_path, dest_location, dest_path, profile=None, printer_profile_id=None, overrides=None, callback=None, callback_args=None):
+	def slice(self, slicer_name, source_location, source_path, dest_location, dest_path, position=None, profile=None, printer_profile_id=None, overrides=None, callback=None, callback_args=None):
 		absolute_source_path = self.get_absolute_path(source_location, source_path)
 
 		def stlProcessed(source_location, source_path, tmp_path, dest_location, dest_path, start_time, printer_profile_id, callback, callback_args, _error=None, _cancelled=False):
@@ -233,6 +233,7 @@ class FileManager(object):
 			temp_path,
 			profile,
 			stlProcessed,
+			position=position,
 			callback_args=args,
 			overrides=overrides,
 			printer_profile_id=printer_profile_id,

src/octoprint/plugins/cura/__init__.py

@@ -229,13 +229,20 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 
 		self._save_profile(path, new_profile, allow_overwrite=allow_overwrite)
 
-	def do_slice(self, model_path, printer_profile, machinecode_path=None, profile_path=None, on_progress=None, on_progress_args=None, on_progress_kwargs=None):
+	def do_slice(self, model_path, printer_profile, machinecode_path=None, profile_path=None, position=None, on_progress=None, on_progress_args=None, on_progress_kwargs=None):
 		if not profile_path:
 			profile_path = s.get(["default_profile"])
 		if not machinecode_path:
 			path, _ = os.path.splitext(model_path)
 			machinecode_path = path + ".gco"
 
+		if position and isinstance(position, dict) and "x" in position and "y" in position:
+			posX = position["x"]
+			posY = position["y"]
+		else:
+			posX = None
+			posY = None
+
 		if on_progress:
 			if not on_progress_args:
 				on_progress_args = ()
@@ -244,7 +251,7 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 
 		self._cura_logger.info("### Slicing %s to %s using profile stored at %s" % (model_path, machinecode_path, profile_path))
 
-		engine_settings = self._convert_to_engine(profile_path, printer_profile)
+		engine_settings = self._convert_to_engine(profile_path, printer_profile, posX, posY)
 
 		executable = s.get(["cura_engine"])
 		if not executable:
@@ -381,8 +388,8 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 		with open(path, "wb") as f:
 			yaml.safe_dump(profile, f, default_flow_style=False, indent="  ", allow_unicode=True)
 
-	def _convert_to_engine(self, profile_path, printer_profile):
-		profile = Profile(self._load_profile(profile_path), printer_profile)
+	def _convert_to_engine(self, profile_path, printer_profile, posX, posY):
+		profile = Profile(self._load_profile(profile_path), printer_profile, posX, posY)
 		return profile.convert_to_engine()
 
 def _sanitize_name(name):

src/octoprint/plugins/cura/profile.py

@@ -514,9 +514,11 @@ class Profile(object):
 
 		return result
 
-	def __init__(self, profile, printer_profile, overrides=None):
+	def __init__(self, profile, printer_profile, posX, posY, overrides=None):
 		self._profile = self.__class__.merge_profile(profile, overrides=overrides)
 		self._printer_profile = printer_profile
+		self._posX = posX
+		self._posY = posY
 
 	def profile(self):
 		import copy
@@ -796,6 +798,24 @@ class Profile(object):
 			return 2
 		return 1
 
+	def get_pos_x(self):
+		if self._posX:
+			try:
+				return int(float(self._posX) * 1000)
+			except ValueError:
+				pass
+
+		return int(self.get_float("machine_width") / 2.0 * 1000) if not self.get_boolean("machine_center_is_zero") else 0.0
+
+	def get_pos_y(self):
+		if self._posY:
+			try:
+				return int(float(self._posY) * 1000)
+			except ValueError:
+				pass
+
+		return int(self.get_float("machine_depth") / 2.0 * 1000) if not self.get_boolean("machine_center_is_zero") else 0.0
+
 	def convert_to_engine(self):
 
 		edge_width, line_count = self.calculate_edge_width_and_line_count()
@@ -844,8 +864,8 @@ class Profile(object):
 			"coolHeadLift": 1 if self.get_boolean("cool_head_lift") else 0,
 
 			# model positioning
-			"posx": int(self.get_float("machine_width") / 2.0 * 1000) if not self.get_boolean("machine_center_is_zero") else 0.0,
-			"posy": int(self.get_float("machine_depth") / 2.0 * 1000) if not self.get_boolean("machine_center_is_zero") else 0.0,
+			"posx": self.get_pos_x(),
+			"posy": self.get_pos_y(),
 
 			# gcodes
 			"startCode": self.get_gcode("start_gcode"),

src/octoprint/server/api/files.py

@@ -340,12 +340,18 @@ def gcodeFileCommand(filename, target):
 		else:
 			printerProfile = None
 
+		if "position" in data.keys() and data["position"] and isinstance(data["position"], dict) and "x" in data["position"] and "y" in data["position"]:
+			position = data["position"]
+			del data["position"]
+		else:
+			position = None
+
 		override_keys = [k for k in data if k.startswith("profile.") and data[k] is not None]
 		overrides = dict()
 		for key in override_keys:
 			overrides[key[len("profile."):]] = data[key]
 
-		ok, result = fileManager.slice(slicer, target, filename, target, gcode_name, profile=profile, printer_profile_id=printerProfile, overrides=overrides)
+		ok, result = fileManager.slice(slicer, target, filename, target, gcode_name, profile=profile, printer_profile_id=printerProfile, position=position, overrides=overrides)
 		if ok:
 			files = {}
 			location = url_for(".readGcodeFile", target=target, filename=gcode_name, _external=True)

src/octoprint/slicing/__init__.py

@@ -95,7 +95,7 @@ class SlicingManager(object):
 	def get_slicer(self, slicer, require_configured=True):
 		return self._slicers[slicer] if slicer in self._slicers and (not require_configured or self._slicers[slicer].is_slicer_configured()) else None
 
-	def slice(self, slicer_name, source_path, dest_path, profile_name, callback, callback_args=None, callback_kwargs=None, overrides=None, on_progress=None, on_progress_args=None, on_progress_kwargs=None, printer_profile_id=None):
+	def slice(self, slicer_name, source_path, dest_path, profile_name, callback, callback_args=None, callback_kwargs=None, overrides=None, on_progress=None, on_progress_args=None, on_progress_kwargs=None, printer_profile_id=None, position=None):
 		if callback_args is None:
 			callback_args = ()
 		if callback_kwargs is None:
@@ -119,7 +119,7 @@ class SlicingManager(object):
 		if printer_profile is None:
 			printer_profile = self._printer_profile_manager.get_current_or_default()
 
-		def slicer_worker(slicer, model_path, machinecode_path, profile_name, overrides, printer_profile, callback, callback_args, callback_kwargs):
+		def slicer_worker(slicer, model_path, machinecode_path, profile_name, overrides, printer_profile, position, callback, callback_args, callback_kwargs):
 			try:
 				slicer_name = slicer.get_slicer_properties()["type"]
 				with self.temporary_profile(slicer_name, name=profile_name, overrides=overrides) as profile_path:
@@ -128,6 +128,7 @@ class SlicingManager(object):
 						printer_profile,
 						machinecode_path=machinecode_path,
 						profile_path=profile_path,
+						position=position,
 						on_progress=on_progress,
 						on_progress_args=on_progress_args,
 						on_progress_kwargs=on_progress_kwargs
@@ -142,7 +143,7 @@ class SlicingManager(object):
 
 		import threading
 		slicer_worker_thread = threading.Thread(target=slicer_worker,
-		                                        args=(slicer, source_path, dest_path, profile_name, overrides, printer_profile, callback, callback_args, callback_kwargs))
+		                                        args=(slicer, source_path, dest_path, profile_name, overrides, printer_profile, position, callback, callback_args, callback_kwargs))
 		slicer_worker_thread.daemon = True
 		slicer_worker_thread.start()
 		return True, None