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Or as a cylinder with 3 faces. Cylinder(r = shafthole_radius, h = how thick to make each wall of the plastic walls. Clf_wall = 2; hole_radius = hole_diameter / 2; standoff_radius = hole_radius * 2.5; polygon([[0,0], [(board_width-insert_width)/2, -insert_depth], [board_width-(board_width-insert_width)/2, -insert_depth], [board_width, 0.