Kossel Roller Carriage

Update 08 March 2014 :
I received the roller, and I've been using them for two weeks now. The movements are very smooth, it seems to work fine. The printing quality is very good for me, see the pictures of the blue printed object (0.2mm layer).
Here a quick video : http://www.youtube.com/watch?v=IDfdNB-six4&list=UU5Kj2JNFg6fteQoEoVRfevw&feature=share

--------------

Hi,
Just want to share a remix of the http://www.thingiverse.com/thing:215438

My motivation to find an alternative to