//MKII leg for 120mm fan $fn=100; //You can adjust the two variables below depth=50; //height of leg hole=4; //screw holes difference(){ union(){ //Main outer cylinder cylinder(h=depth, d1=12, d2=12); } //internal cylinder translate([0,0,2]) cylinder(h=depth+2,d1=10,d2=8); translate([0,0,-1]) cylinder(h=4,d1=hole,d2=hole); translate([0,0,depth-1]) cylinder(h=2,d1=10,d2=10); }