This is for my personal random 3D models.
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196 B

difference()
{
cylinder(h=23, r=30/2, center=true, $fn=50);
translate([0,0,3.01])
cylinder(h=23, r1=24.5/2, r2=25.5/2, center=true, $fn=50);
cylinder(h=100, r=2.5, center=true, $fn=50);
}