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+ rotate_vector_sin * height + rotate_vector_sin * rail_depth] // top 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 h_wall(h=4, l=right_rib_x); } module rail(height) { difference.

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