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Sqrt(2*knob_radius_bottom²). First we move it back from that // most outward position to the base shape. See knob_base(). Rotate([0, 0, 90 + cone_indents_offset_angle + ((360 / cone_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h .

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