MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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Also after printing, my post processing involves filing a bit to remove some debris. With the backside of a sharp knife I cleanup up the threads slowly. Then I used my actual filter and gradually made my way into the threads going back and forth. Then at some point screwing becomes easy. When screwing the first times, the pressure from the filter shape can change slightly the diameter of the adapter. Then it was fine after a few times.