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“as is” and any modifications or additions. Cylinder(r1 = knob_radius_bottom, r2 = knob_radius_top, h = knob_height, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height .

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