diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index 4610e6a454..ef68e8c56e 100755
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -143,25 +143,6 @@ class ExtruderManager(QObject):
                     return self._extruder_trains[global_container_stack.getId()][str(index)]
         return None
 
-    def registerExtruder(self, extruder_train: "ExtruderStack", machine_id: str) -> None:
-        changed = False
-
-        if machine_id not in self._extruder_trains:
-            self._extruder_trains[machine_id] = {}
-            changed = True
-
-        # do not register if an extruder has already been registered at the position on this machine
-        if any(item.getId() == extruder_train.getId() for item in self._extruder_trains[machine_id].values()):
-            Logger.log("w", "Extruder [%s] has already been registered on machine [%s], not doing anything",
-                       extruder_train.getId(), machine_id)
-            return
-
-        if extruder_train:
-            self._extruder_trains[machine_id][extruder_train.getMetaDataEntry("position")] = extruder_train
-            changed = True
-        if changed:
-            self.extrudersChanged.emit(machine_id)
-
     ##  Gets a property of a setting for all extruders.
     #
     #   \param setting_key  \type{str} The setting to get the property of.
diff --git a/cura/Settings/ExtruderStack.py b/cura/Settings/ExtruderStack.py
index 5d4b3e38b1..13dfd18bcc 100644
--- a/cura/Settings/ExtruderStack.py
+++ b/cura/Settings/ExtruderStack.py
@@ -44,9 +44,6 @@ class ExtruderStack(CuraContainerStack):
         stack.addExtruder(self)
         self.setMetaDataEntry("machine", stack.id)
 
-        # For backward compatibility: Register the extruder with the Extruder Manager
-        ExtruderManager.getInstance().registerExtruder(self, stack.id)
-
     @override(ContainerStack)
     def getNextStack(self) -> Optional["GlobalStack"]:
         return super().getNextStack()
diff --git a/tests/TestExtruderManager.py b/tests/TestExtruderManager.py
index f732278e83..6eca0a34ad 100644
--- a/tests/TestExtruderManager.py
+++ b/tests/TestExtruderManager.py
@@ -15,17 +15,3 @@ def test_getAllExtruderSettings(extruder_manager):
     extruder_2.getProperty = MagicMock(return_value="zomg")
     extruder_manager.getActiveExtruderStacks = MagicMock(return_value = [extruder_1, extruder_2])
     assert extruder_manager.getAllExtruderSettings("whatever", "value") == ["beep", "zomg"]
-
-
-def test_registerExtruder(extruder_manager):
-    extruder = createMockedExtruder("beep")
-    extruder.getMetaDataEntry = MagicMock(return_value = "0")  # because the extruder position gets called
-
-    extruder_manager.extrudersChanged = MagicMock()
-    extruder_manager.registerExtruder(extruder, "zomg")
-
-    assert extruder_manager.extrudersChanged.emit.call_count == 1
-
-    # Doing it again should not trigger anything
-    extruder_manager.registerExtruder(extruder, "zomg")
-    assert extruder_manager.extrudersChanged.emit.call_count == 1