M3D filament guide

Designed to be used with the [M3D Horizontal overhead filament holder](http://www.thingiverse.com/thing:959372) and my [M3D spool holder center with bearing](http://www.thingiverse.com/thing:1161255) for the holder and 608 bearings.

I tried using this [filament guide](http://www.thingiverse.com/thing:60588), but the filament kept getting stuck between bearing and the side. I also couldn't find a rotational position that would work all the time without pulling.

I've not had a print shift since I started using this, and the filament doesn't unspool from the holder anymore since it's not jerked when being pulled.

The plug is zip tied to the support leg and has not had any problems.