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[width_mm/2 - h_margin, top_row, 0]; left_rib_x = hole_dist_side + thickness; right_rib_x = width_mm - thickness*2.2; left_rib_x = hole_dist_side + thickness; working_height = height * rotate_vector_cos; [left_edge, rotate_vector_cos * rail_depth], // top horizontal rib // h_wall(h=4, l=right_rib_x); // bottom horizontal rib.

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