Anti wobble/backlash for Prusa i3

I liked the Z axis anti wobble/backlash device made by jamesarm97 ([thing 141479](https://www.thingiverse.com/thing:141479) ) but there was not space for it underneath my X ends.

So I created my own version in OpenScad with the plate supporting the X ends at the bottom, and the spring and top nut nestling next to the X end.

My printer uses 6mm threaded rods, but the scad file is configurable for any nut diameter you like, and I have uploaded stl files for both 5mm and 6mm rods.

The devi