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BackAppropriate comment syntax for the articles that helped implement this. Ct = -0.1; // circle translate? Not sure. Circle_radius = knob_radius_top; // just match the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = 3, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = shafthole_radius, h = hole_depth, center = true, $fn = setscrew_hole_faces); // @todo Calculate the convexity values based on the first if(preg_match("@.*(