from=31.4;
to=34;
toint=32.0;
height=3.5;
int = 29;

$fn=400;

module b() {
	difference() {
		union() {
			cylinder(h = height, r1 = from/2, r2 = to/2);
			translate([0,0,height])
				cylinder(h = height, r1=toint/2, r2=(toint-.5)/2 );
		}

		cylinder(h = 1000, d=int,center=true);
	}
}


b();