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// Empty
rotate_extrude();
// No children
rotate_extrude() { }
// 3D child
rotate_extrude() { cube(); }
// Normal
rotate_extrude() translate([20,0,0]) circle(r=10);
// Sweep of polygon with hole
translate([50,-20,0]) {
difference() {
rotate_extrude() translate([20,0,0]) difference() {
circle(r=10); circle(r=8);
}
translate([-50,0,0]) cube([100,100,100], center=true);
}
}
// Alternative, difference between two solid sweeps
translate([50,50,0]) {
difference() {
difference() {
rotate_extrude() translate([20,0,0]) circle(r=10);
rotate_extrude() translate([20,0,0]) circle(r=8);
}
translate([-50,0,0]) cube([100,100,100], center=true);
}
}
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