diff --git a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
index 96a477031e..6a947866d3 100644
--- a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
+++ b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
@@ -19,6 +19,7 @@ import numpy
 
 catalog = i18nCatalog("cura")
 
+
 class ProcessSlicedLayersJob(Job):
     def __init__(self, layers):
         super().__init__()
@@ -48,7 +49,6 @@ class ProcessSlicedLayersJob(Job):
 
         Application.getInstance().getController().activeViewChanged.connect(self._onActiveViewChanged)
 
-        object_id_map = {}
         new_node = SceneNode()
 
         ## Remove old layer data (if any)
@@ -88,8 +88,8 @@ class ProcessSlicedLayersJob(Job):
             for p in range(layer.repeatedMessageCount("polygons")):
                 polygon = layer.getRepeatedMessage("polygons", p)
 
-                points = numpy.fromstring(polygon.points, dtype="i8") # Convert bytearray to numpy array
-                points = points.reshape((-1,2)) # We get a linear list of pairs that make up the points, so make numpy interpret them correctly.
+                points = numpy.fromstring(polygon.points, dtype="i8")  # Convert bytearray to numpy array
+                points = points.reshape((-1,2))  # We get a linear list of pairs that make up the points, so make numpy interpret them correctly.
 
                 # Create a new 3D-array, copy the 2D points over and insert the right height.
                 # This uses manual array creation + copy rather than numpy.insert since this is
@@ -124,13 +124,13 @@ class ProcessSlicedLayersJob(Job):
                 self._progress.hide()
             return
 
-        #Add layerdata decorator to scene node to indicate that the node has layerdata
+        # Add LayerDataDecorator to scene node to indicate that the node has layer data
         decorator = LayerDataDecorator.LayerDataDecorator()
         decorator.setLayerData(layer_data)
         new_node.addDecorator(decorator)
 
         new_node.setMeshData(mesh)
-        new_node.setParent(self._scene.getRoot()) #Note: After this we can no longer abort!
+        new_node.setParent(self._scene.getRoot())  # Note: After this we can no longer abort!
 
         if not settings.getSettingValue("machine_center_is_zero"):
             new_node.setPosition(Vector(-settings.getSettingValue("machine_width") / 2, 0.0, settings.getSettingValue("machine_depth") / 2))
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index ccd5d32eb3..f51cff5d93 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -14,9 +14,10 @@ from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
 
 from cura.OneAtATimeIterator import OneAtATimeIterator
 
+
 ##  Formatter class that handles token expansion in start/end gcod
 class GcodeStartEndFormatter(Formatter):
-    def get_value(self, key, args, kwargs): # [CodeStyle: get_value is an overridden function from the Formatter class]
+    def get_value(self, key, args, kwargs):  # [CodeStyle: get_value is an overridden function from the Formatter class]
         if isinstance(key, str):
             try:
                 return kwargs[key]
@@ -27,7 +28,8 @@ class GcodeStartEndFormatter(Formatter):
             Logger.log("w", "Incorrectly formatted placeholder '%s' in start/end gcode", key)
             return "{" + str(key) + "}"
 
-##  Job class that handles sending the current scene data to CuraEngine
+
+##  Job that handles sending the current scene data to CuraEngine
 class StartSliceJob(Job):
     def __init__(self, profile, socket):
         super().__init__()
@@ -49,6 +51,7 @@ class StartSliceJob(Job):
             for node in OneAtATimeIterator(self._scene.getRoot()):
                 temp_list = []
 
+                ##  Node can't be printed, so don't bother sending it.
                 if getattr(node, "_outside_buildarea", False):
                     continue
 
@@ -118,7 +121,7 @@ class StartSliceJob(Job):
             return str(value).encode("utf-8")
 
     def _sendSettings(self, profile):
-        msg = self._socket.createMessage("cura.proto.SettingList");
+        msg = self._socket.createMessage("cura.proto.SettingList")
         settings = profile.getAllSettingValues(include_machine = True)
         start_gcode = settings["machine_start_gcode"]
         settings["material_bed_temp_prepend"] = "{material_bed_temperature}" not in start_gcode