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0], // drop to axis [left_edge, -extra_depth], // top horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib // h_wall(h=4, l=right_rib_x); // middle horizontal rib //} module make_surface(filename, h) { for (a = [1, 2, 3.

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