This thing is it diabolo, or a Chinese yoyo. It was made in OpenSCAD with the following code: difference() { union() { cylinder(20,1,10); cylinder(20,10,1); } rotate_extrude(convexity = 10) translate([4, 10, 0]) circle(r = 2); sphere(8); translate([0,0,20])sphere(8); } Supports and not needed on this thing.