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That redistributors of a circle. // Number of facets of rounding cylinder ct = -0.1; // circle translate? Not sure. Circle_radius = knob_radius_top; // just match the top rotate_extrude(convexity=10, $fn = 3, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = 8, h = engraved_indicator_depth * 2, $fn.

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