diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index d3005a78fe..30370e417f 100644
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -5,6 +5,8 @@ from PyQt5.QtCore import pyqtSignal, pyqtProperty, pyqtSlot, QObject, QVariant #
 
 import UM.Application #To get the global container stack to find the current machine.
 import UM.Logger
+from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator #To find which extruders are used in the scene.
+from UM.Scene.SceneNode import SceneNode #To find which extruders are used in the scene.
 import UM.Settings.ContainerRegistry #Finding containers by ID.
 import UM.Settings.SettingFunction
 
@@ -287,6 +289,57 @@ class ExtruderManager(QObject):
             result.append(stack.getProperty(setting_key, property))
         return result
 
+    ##  Gets the extruder stacks that are actually being used at the moment.
+    #
+    #   An extruder stack is being used if it is the extruder to print any mesh
+    #   with, or if it is the support infill extruder, the support interface
+    #   extruder, or the bed adhesion extruder.
+    #
+    #   If there are no extruders, this returns the global stack as a singleton
+    #   list.
+    #
+    #   \return A list of extruder stacks.
+    def getUsedExtruderStacks(self):
+        global_stack = UM.Application.getInstance().getGlobalContainerStack()
+        container_registry = UM.Settings.ContainerRegistry.getInstance()
+
+        if global_stack.getProperty("machine_extruder_count", "value") == 0: #For single extrusion.
+            return [global_stack]
+
+        used_extruder_stack_ids = set()
+
+        #Get the extruders of all meshes in the scene.
+        support_enabled = False
+        support_interface_enabled = False
+        scene_root = UM.Application.getInstance().getController().getScene().getRoot()
+        meshes = [node for node in DepthFirstIterator(scene_root) if type(node) is SceneNode and node.isSelectable()] #Only use the nodes that will be printed.
+        for mesh in meshes:
+            extruder_stack_id = mesh.callDecoration("getActiveExtruder")
+            if not extruder_stack_id: #No per-object settings for this node.
+                extruder_stack_id = self.extruderIds["0"]
+            used_extruder_stack_ids.add(extruder_stack_id)
+
+            #Get whether any of them use support.
+            per_mesh_stack = mesh.callDecoration("getStack")
+            if per_mesh_stack:
+                support_enabled |= per_mesh_stack.getProperty("support_enable", "value")
+                support_interface_enabled |= per_mesh_stack.getProperty("support_interface_enable", "value")
+            else: #Take the setting from the build extruder stack.
+                extruder_stack = container_registry.findContainerStacks(id = extruder_stack_id)[0]
+                support_enabled |= extruder_stack.getProperty("support_enable", "value")
+                support_interface_enabled |= extruder_stack.getProperty("support_enable", "value")
+
+        #The support extruders.
+        if support_enabled:
+            used_extruder_stack_ids.add(self.extruderIds[str(global_stack.getProperty("support_infill_extruder_nr", "value"))])
+            if support_interface_enabled:
+                used_extruder_stack_ids.add(self.extruderIds[str(global_stack.getProperty("support_interface_extruder_nr", "value"))])
+
+        #The platform adhesion extruder. Not used if using brim and brim width is 0.
+        if global_stack.getProperty("adhesion_type", "value") != "brim" or global_stack.getProperty("brim_line_count", "value") > 0:
+            used_extruder_stack_ids.add(self.extruderIds[str(global_stack.getProperty("adhesion_extruder_nr", "value"))])
+
+        return [container_registry.findContainerStacks(id = stack_id)[0] for stack_id in used_extruder_stack_ids]
 
     ##  Removes the container stack and user profile for the extruders for a specific machine.
     #