diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index d222e37bd9..a70683bd21 100644
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -13,7 +13,7 @@ from UM.Resources import Resources
 from UM.Settings.Validator import ValidatorState #To find if a setting is in an error state. We can't slice then.
 from UM.Platform import Platform
 
-from cura.Settings.ExtruderManager import ExtruderManager
+import cura.Settings
 
 from cura.OneAtATimeIterator import OneAtATimeIterator
 from . import ProcessSlicedLayersJob
@@ -63,7 +63,7 @@ class CuraEngineBackend(Backend):
         self._onGlobalStackChanged()
 
         self._active_extruder_stack = None
-        ExtruderManager.getInstance().activeExtruderChanged.connect(self._onActiveExtruderChanged)
+        cura.Settings.ExtruderManager.getInstance().activeExtruderChanged.connect(self._onActiveExtruderChanged)
         self._onActiveExtruderChanged()
 
         #When you update a setting and other settings get changed through inheritance, many propertyChanged signals are fired.
@@ -379,8 +379,8 @@ class CuraEngineBackend(Backend):
             self._active_extruder_stack.propertyChanged.disconnect(self._onSettingChanged)
             self._active_extruder_stack.containersChanged.disconnect(self._onChanged)
 
-        self._active_extruder_stack = ExtruderManager.getInstance().getActiveExtruderStack()
+        self._active_extruder_stack = cura.Settings.ExtruderManager.getInstance().getActiveExtruderStack()
         if self._active_extruder_stack:
             self._active_extruder_stack.propertyChanged.connect(self._onSettingChanged)  # Note: Only starts slicing when the value changed.
             self._active_extruder_stack.containersChanged.connect(self._onChanged)
-            self._onChanged()
\ No newline at end of file
+            self._onChanged()
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 6ed103d0b5..cdfcecb6b9 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -15,7 +15,8 @@ from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
 from UM.Settings.Validator import ValidatorState
 
 from cura.OneAtATimeIterator import OneAtATimeIterator
-from cura.Settings.ExtruderManager import ExtruderManager
+
+import cura.Settings
 
 class StartJobResult(IntEnum):
     Finished = 1
@@ -128,7 +129,7 @@ class StartSliceJob(Job):
 
             self._buildGlobalSettingsMessage(stack)
 
-            for extruder_stack in ExtruderManager.getInstance().getMachineExtruders(stack.getBottom().getId()):
+            for extruder_stack in cura.Settings.ExtruderManager.getInstance().getMachineExtruders(stack.getBottom().getId()):
                 self._buildExtruderMessage(extruder_stack)
 
             for group in object_groups:
@@ -208,4 +209,4 @@ class StartSliceJob(Job):
                 setting = message.addRepeatedMessage("settings")
                 setting.name = key
                 setting.value = str(stack.getProperty(key, "value")).encode("utf-8")
-                Job.yieldThread()
\ No newline at end of file
+                Job.yieldThread()
diff --git a/plugins/SolidView/SolidView.py b/plugins/SolidView/SolidView.py
index 2af4108f23..15cf25e65e 100644
--- a/plugins/SolidView/SolidView.py
+++ b/plugins/SolidView/SolidView.py
@@ -10,7 +10,7 @@ from UM.View.Renderer import Renderer
 
 from UM.View.GL.OpenGL import OpenGL
 
-from cura.Settings.ExtrudersModel import ExtrudersModel
+import cura.Settings
 
 import math
 
@@ -24,7 +24,7 @@ class SolidView(View):
         self._enabled_shader = None
         self._disabled_shader = None
 
-        self._extruders_model = ExtrudersModel()
+        self._extruders_model = cura.Settings.ExtrudersModel()
 
     def beginRendering(self):
         scene = self.getController().getScene()