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Quality, radius, height, and placement indentations_cylinder = true; smoothing_radius = 3; // Number of faces on the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = 3, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = 8.

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