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H_wall(h=1.6, l=right_rib_x); // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // one more to mount a circuit board to, dead center pcb_holder(h=10, l=top_row-rail_clearance*2, th=1.15, wall_thickness=1); // lower h-rib reinforcer cylinder(r=hole_r.

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