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Walls in parallel, close together so a PCB can fit between } module title(string, size=12, halign="center", font=font_for_title) { color([1,0,0]) linear_extrude(thickness+1) text(string, size, halign=halign, font=font); } module rail(height) { difference() { difference() { union() { difference(){ color([.1,.1,.1]) panel(width); // Top radius of the dialhand protruding over the bottom of box [right_edge, -extra_depth], // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // bottom horizontal rib // h_wall(h=1.6, l=right_rib_x); // one more vertical to mount the circuit board to, dead center pcb_holder(h=10, l=top_row-rail_clearance*2, th=1.15, wall_thickness=1); // lower h-rib reinforcer ## Photos [to be added] .

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