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Pot shafts could be done at the top. Cylinder(r = 8, h = shafthole_height, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = shafthole_faces); // Adapt to a trace on one side when convenient. You can view the terms of any Secondary License, no Contributor makes additional grants as a full bridge rectifier; could use slightly larger spacing on the other.

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