Per fer aquest clauer:
translate([11,11,0])
difference(){
cylinder(r=10,h=20,center=true);
cylinder(r=8,h=21,center=true);
}
translate([20,20,0])
sphere(10);
translate([0,16,0])
difference(){
cylinder(r=5,h=2,center=true);
cylinder(r=4,h=10,center=true);
}
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