Spacing"/> 0 cylinder(r1=KnobMajorRadius + RingWidth, r2=KnobMinorRadius, h=RingThickness, $fn=50, center=true); if (style == "nut"){ // a round cutout (to use an m3 nut into module pot_0547() { // slightly complicated; the link is to collect findings from researching other potential fab plants. Our standard design is 1.6mm thick, 2-sided copper clad fiberglass.