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Back- thickness*2; // draw panel, subtract holes union() { z_position = height - v_margin; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff col_middle = col_left + (15.6 + 1.5 + 7 segment LCD Double digit seven segment green LED, http://www.kingbrightusa.com/images/catalog/SPEC/CA56-12SRWA.pdf 4 digit 7 segment LCD 3 1/5 digit LOW BAT + 7-Segment 4 digit.