module thing()
{
	crad = 1;
	difference() {
		sphere(r = 2);
		cylinder(h = 62.5, r1 = crad, r2 = crad, center = true);
	}
}
 
module demo_proj()
{
	linear_extrude(center = true, height = 0.5) projection(cut = false) thing();
	thing();
}
 
demo_proj();