Z wobble stabilizer for Prusa based designs

The threaded rods on a lot of cheaper printers are slightly bent, this creates a banding pattern on the print because the carriage wobbles.
This design counters this by decoupling the carriage and the threaded rod.

Based on this design: http://www.thingiverse.com/thing:1431036
In contrast, my design helps wobble in both the x and the y direction.

The instructions are the same as for that one, put a nut in the print at the bottom and have it on the threaded rod.
It then will support th