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Thanks for this information. I’ve already tried making 2 new files but getting the faces and extruding them. This didn’t work so I turned to a professional. He said that we can’t rework this mesh and he would have to start it from scratch, unfortunately. I know there are ways to do it but it requires a lot of money. I was just hoping that there was something similar to prusa slicer where you can select parts of the model for dual extrusion,