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The convexity values based on the bottom of box [right_edge, -extra_depth], // bottom horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle-bottom h rib // h_wall(h=1.6, l=right_rib_x); // bottom horizontal rib // h_wall(h=1.6, l=right_rib_x); // one more vertical to mount a circuit board sideways on // h = shafthole_height, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, $fn = sphere_indents_faces); height = cone_indents_height + 2.

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