PrintrBot Simple Roller Extender

MrChristo came up with a great idea of combining my roller http://www.thingiverse.com/thing:288300 with MH2014's rollers http://www.thingiverse.com/thing:240032. Roller Extenders were born! This is really the best of both worlds. Combine them with my PrintrBot Simple Roller http://www.thingiverse.com/thing:288300

Note: 1 full kg spool seems a bit too heavy for the device. I suggest 1/2 kg or less.

Now in original (7mm) and extended (12mm)