i3 Adjustable Y-Axis Holder for GT2 Belt

Remixed of the [original version](http://www.thingiverse.com/thing:188958) but for GT2 belt.
I've been meaning to put this out for a while now but just didn't have the time. Sorry for the long wait.

2 versions, lower profile & high profile. And two ways to ziptie it.

Make sure to use active cooling if you can because of the small size of the groove that hold the belt. Also printing at .2 layer height will give you better results on this part.