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Middle one unused row_1 = bottom_row + v_margin + 12; row_1 = bottom_row + v_margin + 12; top_row = height - v_margin; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff col_left = thickness * 1; right_rib_x = width_mm - thickness; // column from edge plus hole radius //calculated x.

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