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Based heavily on Moritz Klein's work, but with buffering between (some) stages. Needs a _big_ knob, these are not derived from the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_transition_height, r1 = stem_radius, $fn = smooth // outer.

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