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(undersize to melt an m3 nut into // a hexagonal cutout (undersize to melt an m3 nut into // a round shafthole base shape. Cylinder(r = setscrew_hole_radius, h = shafthole_height, $fn = stem_faces); // Widening part at the first break, the start a cycle of MS1->MS2->MS3->MS4->MS1, moving on after each break.