This is an adapter to fit Misumi lead screw nut part no. MTSKR8 (http://us.misumi-ec.com/us/ItemDetail/10302300140.html) to the Aleph Objects X-Ends (http://www.thingiverse.com/thing:15492). This will allow you to convert your Prusa, MendelMax, or other variant to lead screws without having to replace the entire x-end. This should make the conversion somewhat easier. Tested on my machine, works as expected.Print 2 of these, insert lead screw nuts, trap with an M3 bolt through the hole in the side, and replace the old clamp/threaded rod with the new assembly and lead screw.