diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index c375ce01d1..e26b82e487 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -88,12 +88,14 @@ class MachineManager(QObject):
 
         self._onGlobalContainerChanged()
 
-        ExtruderManager.getInstance().activeExtruderChanged.connect(self._onActiveExtruderStackChanged)
+        extruder_manager = self._application.getExtruderManager()
+
+        extruder_manager.activeExtruderChanged.connect(self._onActiveExtruderStackChanged)
         self._onActiveExtruderStackChanged()
 
-        ExtruderManager.getInstance().activeExtruderChanged.connect(self.activeMaterialChanged)
-        ExtruderManager.getInstance().activeExtruderChanged.connect(self.activeVariantChanged)
-        ExtruderManager.getInstance().activeExtruderChanged.connect(self.activeQualityChanged)
+        extruder_manager.activeExtruderChanged.connect(self.activeMaterialChanged)
+        extruder_manager.activeExtruderChanged.connect(self.activeVariantChanged)
+        extruder_manager.activeExtruderChanged.connect(self.activeQualityChanged)
 
         self.globalContainerChanged.connect(self.activeStackChanged)
         self.globalValueChanged.connect(self.activeStackValueChanged)