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Back+12V, value unknown Add position for resistor between the 'K' side of the rail + a safety margin width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of 2mm - but adjust to shift left and right columns toward the center center_adjust = 5; //mm center_col = width_mm/2; row_1 = v_margin+12; row_2 = row_1 + vertical_space/7; cv_in_1a = [left_col, row_1, 0]; fm_pot = [input_column - h_margin/2, bottom_row, 0]; fm_in = [input_column - h_margin/2, row_1, 0]; triangle_out = [third_col, fifth_row, 0]; //left_rib_x = thickness * 2; right_rib_x = width_mm - thickness*2; left_rib_x = thickness + 6 + tolerance; // left_panel_width = 12.5*3 + tolerance*4 + 8; //three knobs plus space between them right_panel_width = width_mm - right_rib_thickness; // projection: make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top horizontal rib // h_wall(h=1.6, l=right_rib_x); // one more vertical to mount a circuit board to, dead center // one more vertical to mount the circuit board sideways on // h = z height, i.e. How tall the wall along the LEDs //outline of whole PCB? // cube([137.5, 97, 1], center=true); working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff working_height = height - rail_clearance - thickness*2 - 16.5/2; // 16.5 is the first $orig_content if (preg_match("@.*(