diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index b6b7b31936..5ef308c779 100755
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -224,7 +224,16 @@ class ExtruderManager(QObject):
 
         # Get the extruders of all printable meshes in the scene
         meshes = [node for node in DepthFirstIterator(scene_root) if isinstance(node, SceneNode) and node.isSelectable()] #type: ignore #Ignore type error because iter() should get called automatically by Python syntax.
+
+        # Exclude anti-overhang meshes
+        mesh_list = []
         for mesh in meshes:
+            stack = mesh.callDecoration("getStack")
+            if stack is not None and (stack.getProperty("anti_overhang_mesh", "value") or stack.getProperty("support_mesh", "value")):
+                continue
+            mesh_list.append(mesh)
+
+        for mesh in mesh_list:
             extruder_stack_id = mesh.callDecoration("getActiveExtruder")
             if not extruder_stack_id:
                 # No per-object settings for this node
diff --git a/resources/definitions/hms434.def.json b/resources/definitions/hms434.def.json
index dfb39fa344..163f3fbec2 100644
--- a/resources/definitions/hms434.def.json
+++ b/resources/definitions/hms434.def.json
@@ -121,7 +121,7 @@
 
         "retraction_hop_enabled": {"value": false},
         "retraction_hop":         {"value": 1},
-        "retraction_combing":     {"value": "off"},
+        "retraction_combing":     {"value": "'off'"},
 
         "cool_fan_speed":                    {"value": 0},
         "cool_fan_enabled":                  {"value": true},