diff --git a/core/nodeslicer/nodes/mesh.py b/core/nodeslicer/nodes/mesh.py
index 864892e..fa31780 100644
--- a/core/nodeslicer/nodes/mesh.py
+++ b/core/nodeslicer/nodes/mesh.py
@@ -867,7 +867,7 @@ def _apply_modifiers_to_so(
     if part_type != "NO_CHANGE":
         so.object_type = part_type
     if extruder != "NO_CHANGE":
-        so.extruder = extruder
+        so.extruder = int(extruder)
     if modifiers_dict:
         existing = {m['param_id']: str(m['param_value']) for m in getattr(so, 'modifiers', []) if m and 'param_id' in m}
         for k, v in modifiers_dict.items():