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Ribs? // top right [left_edge + height * rotate_vector_cos, rotate_vector_sin * height + rotate_vector_sin * rail_depth] // top right [left_edge + height * rotate_vector_cos, rotate_vector_sin * height], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * rail_depth] // top horizontal rib // middle horizontal rib // h_wall(h=4, l=right_rib_x); // one more to mount a circuit board to module make_surface(filename, h.

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