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Module make_surface(filename, h) { cylinder(r=hole_r, h=thickness*2); echo("Putting a hole with radius: ", hole_r , " at ", width_mm - thickness; // draw panel, subtract holes union() { difference(){ color([.1,.1,.1]) panel(width); // lower h-rib reinforcer cylinder(r=hole_r, h=thickness*2); echo("Putting a hole.

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