diff --git a/PrinterConnection.py b/PrinterConnection.py
index a9be3d9309..0ec7435817 100644
--- a/PrinterConnection.py
+++ b/PrinterConnection.py
@@ -95,7 +95,7 @@ class PrinterConnection(SignalEmitter):
             return
         self._gcode = gcode_list
         #Reset line number. If this is not done, first line is sometimes ignored
-        self._gcode.insert(0,"M110 N0") 
+        self._gcode.insert(0, "M110")
         self._gcode_position = 0
         self._print_start_time_100 = None
         self._is_printing = True
@@ -152,8 +152,7 @@ class PrinterConnection(SignalEmitter):
                         self.setIsConnected(True)
                         return 
         self.setIsConnected(False)
-    
-    
+
     ##  Set the baud rate of the serial. This can cause exceptions, but we simply want to ignore those.
     def setBaudRate(self, baud_rate):
         try:
@@ -161,9 +160,7 @@ class PrinterConnection(SignalEmitter):
             return True
         except Exception as e:
             return False
-    
-    
-    
+
     def setIsConnected(self, state):
         self._is_connecting = False
         if self._is_connected != state:
@@ -377,4 +374,3 @@ class PrinterConnection(SignalEmitter):
                 #ret.remove(prev)
                 #ret.insert(0, prev)
         return ret
-            
\ No newline at end of file
diff --git a/USBPrinterManager.py b/USBPrinterManager.py
index 3dde9aca0b..e3102d2e33 100644
--- a/USBPrinterManager.py
+++ b/USBPrinterManager.py
@@ -142,35 +142,25 @@ class USBPrinterManager(QObject, SignalEmitter,PluginObject):
         
     def serialConectionStateCallback(self,serial_port):
         connection = self.getConnectionByPort(serial_port)
-        if connection is not None:
-            if connection.isConnected():
-                Application.getInstance().addOutputDevice(serial_port, {
-                    'id': serial_port,
-                    'function': self._writeToSerial,
-                    'description': 'Write to USB {0}'.format(serial_port),
-                    'icon': 'print_usb',
-                    'priority': 1
-                })
-            else:
-                Application.getInstance().removeOutputDevice(serial_port)
-    
-    
+        if connection.isConnected():
+            Application.getInstance().addOutputDevice(serial_port, {
+                'id': serial_port,
+                'function': self._writeToSerial,
+                'description': 'Write to USB {0}'.format(serial_port),
+                'icon': 'print_usb',
+                'priority': 1
+            })
+        else:
+            Application.getInstance().removeOutputDevice(serial_port)
+
     def _writeToSerial(self, serial_port):
-        ## Create USB control window
-        #self.view = QQuickView()
-        #self.view.setSource(QUrl("plugins/USBPrinting/ControlWindow.qml"))
-        #self.view.show()
-        
-        #self.view.engine().rootContext().setContextProperty('manager',self)
-        
-        for node in DepthFirstIterator(Application.getInstance().getController().getScene().getRoot()):
-            if type(node) is not SceneNode or not node.getMeshData():
-                continue
-            
-            gcode = getattr(node.getMeshData(), 'gcode', False)
-            self.sendGCodeByPort(serial_port,gcode.split('\n'))
-            
-        
+        gcode_list = getattr(Application.getInstance().getController().getScene(), 'gcode_list', None)
+        if gcode_list:
+            final_list = []
+            for gcode in gcode_list:
+                final_list += gcode.split('\n')
+            self.sendGCodeByPort(serial_port, gcode_list)
+
     ## Get a list of printer connection objects that are connected.
     def getActiveConnections(self):
         return [connection for connection in self._printer_connections if connection.isConnected()]