Bearing adapter for fillament support

I had an issue with the filament support, it got stuck sometimes and I could see some missing layers from time to time.
I decided to look for a solution and the best one was from "Sneakypoo" in that thing :

http://www.thingiverse.com/thing:235925

The all idea is good but not working for me , so I decided to make my own thing.

I ended by creating an adapter for the PLA roll it self

I used two 6001 bearings ( ExtD 28mm IntD 12mm )
printed with PLA
layer 0.1 mm
spee