diff --git a/NetworkPrinterOutputDevice.py b/NetworkPrinterOutputDevice.py
index 712c48a865..efc34ecf52 100644
--- a/NetworkPrinterOutputDevice.py
+++ b/NetworkPrinterOutputDevice.py
@@ -109,7 +109,7 @@ class NetworkPrinterOutputDevice(PrinterOutputDevice):
         self._updateHeadPosition(head_x, head_y, head_z)
 
     def close(self):
-        self._connection_state == ConnectionState.closed
+        self.setConnectionState(ConnectionState.closed)
         self._update_timer.stop()
 
     def requestWrite(self, node, file_name = None, filter_by_machine = False):
diff --git a/NetworkPrinterOutputDevicePlugin.py b/NetworkPrinterOutputDevicePlugin.py
index 9c187e5065..fed761b772 100644
--- a/NetworkPrinterOutputDevicePlugin.py
+++ b/NetworkPrinterOutputDevicePlugin.py
@@ -32,7 +32,6 @@ class NetworkPrinterOutputDevicePlugin(OutputDevicePlugin):
         self._zero_conf.close()
 
     def _onGlobalStackChanged(self):
-
         active_machine = Application.getInstance().getGlobalContainerStack()
         if not active_machine:
             return
@@ -41,6 +40,7 @@ class NetworkPrinterOutputDevicePlugin(OutputDevicePlugin):
             if key == active_machine.getMetaDataEntry("key"):
                 self._printers[key].connect()
                 self._printers[key].connectionStateChanged.connect(self._onPrinterConnectionStateChanged)
+            else:
                 self._printers[key].close()
 
     ##  Because the model needs to be created in the same thread as the QMLEngine, we use a signal.