latest version:

Tired of trying to align Z threaded rods and get rid of wobble I created X mounts that absorbs XY movements that Z threaded rods cause when not perfectly aligned. The absorbing structures use same principle of some lunar rover wheels. The structure uses ABS flexibility as absorber.
http://youtu.be/XAVHZ00X4DM

On Z threaded rods, to limit vertical movement of nuts it's necessary to glue and small lid over upper nut. Inside use the common nut spring nut system.

The part I printed got a little bit fragile, I have to do some improvements but works great!

http://youtu.be/XAVHZ00X4DM

If you are having difficulties on slicing it try yo rotate the part.

I also have to check out if the "ABS spring" won't break due to fatigue after a lot of prints.