openSCAD models for 3d-printing
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220 B

in=30;
out=44.3;
shaft=16;
difference() {
union() {
cylinder(r1=in/2, r2=in/2, h=20, $fn=80);
cylinder(r1=out/2, r2=out/2, h=12, $fn=80);
}
cylinder(r1=shaft/2, r2=shaft/2, h=20, $fn=80);
}