diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index a2b049277f..77fda73b43 100644
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -78,6 +78,9 @@ class CuraEngineBackend(Backend):
 
         self.backendConnected.connect(self._onBackendConnected)
 
+    ##  Get the command that is used to call the engine.
+    #   This is usefull for debugging and used to actually start the engine
+    #   \return list of commands and args / parameters.
     def getEngineCommand(self):
         return [Preferences.getInstance().getValue("backend/location"), "connect", "127.0.0.1:{0}".format(self._port),  "-j", Resources.getPath(Resources.MachineDefinitions, "fdmprinter.json"), "-vv"]
 
@@ -120,7 +123,7 @@ class CuraEngineBackend(Backend):
                     pass
             self.slicingCancelled.emit()
             return
-
+        Logger.log("d", "Preparing to send slice data to engine.")
         object_groups = []
         if self._profile.getSettingValue("print_sequence") == "one_at_a_time":
             for node in OneAtATimeIterator(self._scene.getRoot()):
@@ -214,6 +217,7 @@ class CuraEngineBackend(Backend):
             self._handlePerObjectSettings(group[0], group_message)
 
         self._scene.releaseLock()
+        Logger.log("d", "Sending data to engine for slicing.")
         self._socket.sendMessage(slice_message)
 
     def _onSceneChanged(self, source):
@@ -225,7 +229,6 @@ class CuraEngineBackend(Backend):
 
         self._onChanged()
 
-
     def _onActiveProfileChanged(self):
         if self._profile:
             self._profile.settingValueChanged.disconnect(self._onSettingChanged)
@@ -310,10 +313,10 @@ class CuraEngineBackend(Backend):
             self._restart = False
 
     def _onToolOperationStarted(self, tool):
-        self._enabled = False
+        self._enabled = False # Do not reslice when a tool is doing it's 'thing'
 
     def _onToolOperationStopped(self, tool):
-        self._enabled = True
+        self._enabled = True # Tool stop, start listening for changes again.
         self._onChanged()
 
     def _onActiveViewChanged(self):
diff --git a/plugins/CuraEngineBackend/LayerData.py b/plugins/CuraEngineBackend/LayerData.py
index 597839ea39..6634867da2 100644
--- a/plugins/CuraEngineBackend/LayerData.py
+++ b/plugins/CuraEngineBackend/LayerData.py
@@ -217,7 +217,7 @@ class Polygon():
         elif self._type == self.SkirtType:
             return Color(0.0, 1.0, 1.0, 1.0)
         elif self._type == self.InfillType:
-            return Color(1.0, 1.0, 0.0, 1.0)
+            return Color(1.0, 0.74, 0.0, 1.0)
         elif self._type == self.SupportInfillType:
             return Color(0.0, 1.0, 1.0, 1.0)
         else:
diff --git a/plugins/CuraEngineBackend/LayerDataDecorator.py b/plugins/CuraEngineBackend/LayerDataDecorator.py
index 81ce241be5..c04479972a 100644
--- a/plugins/CuraEngineBackend/LayerDataDecorator.py
+++ b/plugins/CuraEngineBackend/LayerDataDecorator.py
@@ -1,5 +1,6 @@
 from UM.Scene.SceneNodeDecorator import SceneNodeDecorator
 
+## Simple decorator to indicate a scene node holds layer data.
 class LayerDataDecorator(SceneNodeDecorator):
     def __init__(self):
         super().__init__()
diff --git a/plugins/CuraEngineBackend/ProcessGCodeJob.py b/plugins/CuraEngineBackend/ProcessGCodeJob.py
index 59ab380503..697d20b053 100644
--- a/plugins/CuraEngineBackend/ProcessGCodeJob.py
+++ b/plugins/CuraEngineBackend/ProcessGCodeJob.py
@@ -4,7 +4,6 @@
 from UM.Job import Job
 from UM.Application import Application
 
-
 class ProcessGCodeLayerJob(Job):
     def __init__(self, message):
         super().__init__()
diff --git a/plugins/USBPrinting/PrinterConnection.py b/plugins/USBPrinting/PrinterConnection.py
index 1ce69a3c55..bb1de905a4 100644
--- a/plugins/USBPrinting/PrinterConnection.py
+++ b/plugins/USBPrinting/PrinterConnection.py
@@ -273,6 +273,7 @@ class PrinterConnection(OutputDevice, QObject, SignalEmitter):
             else:
                 if not self.setBaudRate(baud_rate):
                     continue # Could not set the baud rate, go to the next
+            Logger.log("d","Attempting to connect to printer with serial %s on baud rate %s", self._serial_port, baud_rate)
             time.sleep(1.5) # Ensure that we are not talking to the bootloader. 1.5 sec seems to be the magic number
             sucesfull_responses = 0
             timeout_time = time.time() + 5
@@ -609,7 +610,7 @@ class PrinterConnection(OutputDevice, QObject, SignalEmitter):
     ##  Create a list of baud rates at which we can communicate.
     #   \return list of int
     def _getBaudrateList(self):
-        ret = [250000, 230400, 115200, 57600, 38400, 19200, 9600]
+        ret = [115200, 250000, 230400, 57600, 38400, 19200, 9600]
         return ret
 
     def _onFirmwareUpdateComplete(self):