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[width_mm/2, top_row, 0]; left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2; // draw a horizontal wall (across the panel module h_wall(h, l, th=thickness) { module v_wall(h, w) { // not a very large range of in-tune response, but comments discuss potential fixes, maybe worth it for a.

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