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Knob_radius_bottom, r2 = knob_radius_top, h = engraved_indicator_depth * 2, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height + nothing, = stem_radius, $fn = sphere_indents_faces); height = cone_indents_height + 2 * nothing; z_position = height - v_margin.

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