Simple Prusa z-wobble stabilizer

There are a lot of very nice Z-screw accessories out there, but this one is bog-simple. Print it off, then snug it into the z-screw hole at the top of the frame. It should fit slightly snugly on the z-screw and rotate with a slight amount of friction in the socket on the frame. Sand it a little if it binds. This is not as robust as one with a bearing, but it does work and reduces play to next to nothing. This is specifically for a Hesine Prusa i3, but the same concept should work for any printer