diff --git a/cura/Machines/MaterialManager.py b/cura/Machines/MaterialManager.py
index aee96f3153..4d9574bf38 100644
--- a/cura/Machines/MaterialManager.py
+++ b/cura/Machines/MaterialManager.py
@@ -302,6 +302,10 @@ class MaterialManager(QObject):
     def getMaterialGroupListByGUID(self, guid: str) -> Optional[List[MaterialGroup]]:
         return self._guid_material_groups_map.get(guid)
 
+    # Returns a dict of all material groups organized by root_material_id.
+    def getAllMaterialGroups(self) -> Dict[str, "MaterialGroup"]:
+        return self._material_group_map
+
     #
     # Return a dict with all root material IDs (k) and ContainerNodes (v) that's suitable for the given setup.
     #