Adjustable Filament Holder with 608zz bearings

I really liked the design from the original here: http://www.thingiverse.com/thing:26472 however since I have the straight frame on the K8200, I couldn't find a good way to mount, so I remixed this in tinkercad.

I used 5mm threaded bolts on both the bearing holes and mounting on the frame. I added the channel on each side's base to allow minor adjustments on the holder relative to the frame.

EDIT: For an added feeling of security that the roll won't come off the bearings, I added the two