Frictionless Filament Feeder

See this thing in action on:
http://youtu.be/01HIZuBam00
http://youtu.be/MP64M0xKElQ

I wanted to create a filament holder where the extruder wouldn't need to pull the reel to get it's filament deliverd. So i made this motorized version. It's dead simple, two cheap toy motors rotate the wheel when there is enough pull on the filament.
The pull is detected by two microswitches, either one of them switches current to the motors. This way you never have to turn anything on or off. The filam