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A bigger flat flat_size = 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 = how deep to make fitting inside a case easier. Or 10mm if.

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