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= [ [left_edge, rotate_vector_cos * rail_depth], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib h_wall(h=1.6, l=right_rib_x); // bottom right [right_edge, rotate_vector_sin * rail_depth] // top horizontal rib // h_wall(h=4, l=right_rib_x); // bottom horizontal rib // one more to mount the circuit board to, dead center pcb_holder(h=10, l=top_row-rail_clearance*2, th=1.15, wall_thickness=1); // lower.

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