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+ pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = knob_faces); // @todo Calculate the convexity values based on a stem to form a mushroom shape. Enable_stem = false; // Number of faces around the top edge or circumference using cones or cylinders.

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