K8200 Z axis nut-holder anti wobbling and backlash

Replace the original nut holder by this one to reduce Z-axis wobbling and backlash.

Inspired from http://www.thingiverse.com/thing:235494 and http://www.thingiverse.com/thing:166030

I use it in combination with http://www.thingiverse.com/thing:361064 and http://www.thingiverse.com/thing:135151