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Box [right_edge, -extra_depth], // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib // h_wall(h=1.6, l=right_rib_x); // one more vertical to mount a circuit board sideways on // h = z height, e.g. Height of the Pelorinho Trio Eléctrico (11:52 - 15:50)

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