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5 square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, r2 = knob_radius_top, h = engraved_indicator_depth * 2, $fn = knob_faces); // @todo Refactor the scaling.

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