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= working_height / 6; // generally-useful spacing amount for vertical columns of stuff working_height = height - v_margin*2 - title_font_size; working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_left = thickness * 2; right_rib_x = width_mm - thickness*2; // draw panel, subtract holes // v_wall(h=4, l=height-rail_clearance*2-thickness); // top horizontal rib // h_wall(h=4, l=right_rib_x); // middle horizontal rib // one more vertical to mount a circuit board to.

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