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Hp_mm(h); difference() { difference() { difference() { // make a hole with radius: ", hole_r , " at ", hole_dist_side, height - v_margin*2 - title_font_size; 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 * 1.2; right_rib_x = width_mm - thickness*2; left_rib_x.

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