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Circle_radius = knob_radius_top; // just match the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = smooth } module rail(height) { difference() { difference() { Fix for.

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