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// slider pot slit // make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); //outline of whole PCB? // cube([137.5, 97, 1], center=true); working_increment = working_height / (8+tolerance/5); // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; col_right = width_mm - thickness*2.2; left_rib_x = thickness + 6 + tolerance; // rib + half.