Anti backlash Z isolator for 3D printers

This is my design to avoid wobble on the hotend caused by a not straight z-rod.
This thing avoids both wobble and nut backlash by isolating the x and y movement of the z-rod.

Of course you can solve all these problems by buying a very G$$D quality z-rod. :-)

Z-isolator in action:
http://youtu.be/Ix8PHHisDuw