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Sizes threeUHeight = 133.35; //overall 3u height panelOuterHeight =128.5; panelInnerHeight = 110; //rail clearance = ~11.675mm, top and bottom boards. Final work on PCB sandwich, making some final-ish decisions about connecting to front panel design and includes 2.5mm centerward shift for input and output jacks output_column = width_mm - 9.5/2 - right_rib_thickness - tolerance; // left_panel_width = 12.5*3 + tolerance*4 + 8; //three knobs plus space between them left_panel_spacing = left_panel_width / 3 + tolerance*8; echo("Left panel:", left_panel_width, " with spacing ", left_panel_spacing); right_panel_width = width_mm - hole_dist_side - thickness; module label(string.