diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index c1c2544c6e..c141ac9b0e 100755
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -1,7 +1,7 @@
 # Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
-from typing import Any, cast, Dict, List, Optional
+from typing import Any, cast, List, Optional
 from PyQt5.QtCore import pyqtProperty, pyqtSignal, QObject
 
 from UM.Application import Application
@@ -364,22 +364,3 @@ class _ContainerIndexes:
 
     # Reverse lookup: type -> index
     TypeIndexMap = dict([(v, k) for k, v in IndexTypeMap.items()])
-
-    # Mapping to old values before Intent introduction. Used for reading older versions of input files.
-    IndexToOldIndexMap = {
-        UserChanges: 0,
-        QualityChanges: 1,
-        Intent: -1,  # Wasn't there in the old 'format'!
-        Quality: 2,
-        Material: 3,
-        Variant: 4,
-        DefinitionChanges: 5,
-        Definition: 6,
-    }
-
-    # Reverse lookup: old index -> new index
-    OldIndexToIndexMap = dict([(v, k) for k, v in IndexToOldIndexMap.items()])
-
-    @classmethod
-    def getIndexMapping(cls, setting_version: int) -> Dict[int, int]:
-        return dict([(x, x) for x in list(range(99))]) if setting_version >= 10 else cls.IndexToOldIndexMap
diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index 46584aea98..d5bc4e74c6 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -371,8 +371,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
         # Get quality type
         parser = ConfigParser(interpolation = None)
         parser.read_string(serialized)
-        index_map_version = _ContainerIndexes.getIndexMapping(int(parser["metadata"]["setting_version"]))
-        quality_container_id = parser["containers"][str(index_map_version[_ContainerIndexes.Quality])]
+        quality_container_id = parser["containers"][str(_ContainerIndexes.Quality)]
         quality_type = "empty_quality"
         if quality_container_id not in ("empty", "empty_quality"):
             quality_type = instance_container_info_dict[quality_container_id].parser["metadata"]["quality_type"]
@@ -382,11 +381,10 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
         serialized = GlobalStack._updateSerialized(serialized, global_stack_file)
         parser = ConfigParser(interpolation = None)
         parser.read_string(serialized)
-        index_map_version = _ContainerIndexes.getIndexMapping(int(parser["metadata"]["setting_version"]))
-        definition_changes_id = parser["containers"][str(index_map_version[_ContainerIndexes.DefinitionChanges])]
+        definition_changes_id = parser["containers"][str(_ContainerIndexes.DefinitionChanges)]
         if definition_changes_id not in ("empty", "empty_definition_changes"):
             self._machine_info.definition_changes_info = instance_container_info_dict[definition_changes_id]
-        user_changes_id = parser["containers"][str(index_map_version[_ContainerIndexes.UserChanges])]
+        user_changes_id = parser["containers"][str(_ContainerIndexes.UserChanges)]
         if user_changes_id not in ("empty", "empty_user_changes"):
             self._machine_info.user_changes_info = instance_container_info_dict[user_changes_id]
 
@@ -396,8 +394,8 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
 
             extruder_info = ExtruderInfo()
             extruder_info.position = position
-            variant_id = parser["containers"][str(index_map_version[_ContainerIndexes.Variant])]
-            material_id = parser["containers"][str(index_map_version[_ContainerIndexes.Material])]
+            variant_id = parser["containers"][str(_ContainerIndexes.Variant)]
+            material_id = parser["containers"][str(_ContainerIndexes.Material)]
             if variant_id not in ("empty", "empty_variant"):
                 extruder_info.variant_info = instance_container_info_dict[variant_id]
             if material_id not in ("empty", "empty_material"):
@@ -405,7 +403,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                 extruder_info.root_material_id = root_material_id
             self._machine_info.extruder_info_dict[position] = extruder_info
         else:
-            variant_id = parser["containers"][str(index_map_version[_ContainerIndexes.Variant])]
+            variant_id = parser["containers"][str(_ContainerIndexes.Variant)]
             if variant_id not in ("empty", "empty_variant"):
                 self._machine_info.variant_info = instance_container_info_dict[variant_id]
         QCoreApplication.processEvents()  # Ensure that the GUI does not freeze.
@@ -417,14 +415,13 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             serialized = ExtruderStack._updateSerialized(serialized, extruder_stack_file)
             parser = ConfigParser(interpolation = None)
             parser.read_string(serialized)
-            index_map_version = _ContainerIndexes.getIndexMapping(int(parser["metadata"]["setting_version"]))
 
             # The check should be done for the extruder stack that's associated with the existing global stack,
             # and those extruder stacks may have different IDs.
             # So we check according to the positions
             position = parser["metadata"]["position"]
-            variant_id = parser["containers"][str(index_map_version[_ContainerIndexes.Variant])]
-            material_id = parser["containers"][str(index_map_version[_ContainerIndexes.Material])]
+            variant_id = parser["containers"][str(_ContainerIndexes.Variant)]
+            material_id = parser["containers"][str(_ContainerIndexes.Material)]
 
             extruder_info = ExtruderInfo()
             extruder_info.position = position
@@ -438,11 +435,11 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                 root_material_id = reverse_material_id_dict[material_id]
                 extruder_info.root_material_id = root_material_id
 
-            definition_changes_id = parser["containers"][str(index_map_version[_ContainerIndexes.DefinitionChanges])]
+            definition_changes_id = parser["containers"][str(_ContainerIndexes.DefinitionChanges)]
             if definition_changes_id not in ("empty", "empty_definition_changes"):
                 extruder_info.definition_changes_info = instance_container_info_dict[definition_changes_id]
 
-            user_changes_id = parser["containers"][str(index_map_version[_ContainerIndexes.UserChanges])]
+            user_changes_id = parser["containers"][str(_ContainerIndexes.UserChanges)]
             if user_changes_id not in ("empty", "empty_user_changes"):
                 extruder_info.user_changes_info = instance_container_info_dict[user_changes_id]
             self._machine_info.extruder_info_dict[position] = extruder_info