QUBD : Bearing holder to prevent z-rod wobbling

This is redesign and mix of
http://www.thingiverse.com/thing:289966
http://www.thingiverse.com/thing:754526

The changes are

- Instead of the 608zz ball bearing, I use the flange bearing. as my local HomeDepot had stock.
http://www.homedepot.com/p/Crown-Bolt-3-8-in-x-5-8-in-x-1-in-Bronze-Flange-Bearing-57738/203537359
I hope this longer shelve provides the z-rod even less room to tilt.

- Instead of bridging very long lid (40[mm]), I separate them into 2 parts (bod