Filament Bug - Filament Trimmer

Update#2: I designed both an eyeball and a T-Slot friendly version, so I thought I'd show you how it works in this video:
https://youtu.be/xJj6qhpamfQ
These are 12mm plastic eyeballs from china, Ebay here:
http://www.ebay.com/itm/331714307888?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Version 4 works great with both 3mm and 1.75 and can attach easily to a T-slot printer like my Taz 5, shown in the video.

Update: I uploaded a newer version (V3) with a different cutting angl