Ultimaker Belt Tensioner

This is an upgrade/mod for Ultimaker or really any belt-driven device.

I had some slack belts on my Ultimaker, and I was inspired by this parametric buckle http://www.thingiverse.com/thing:9633 to come up with a printable solution.

My first version was closed and similar to the belt buckle, but then I realized the difficulty in mounting it to the belt since it would have involved attaching the screw under tension. A quick Dremelling added a gap that I used to then slide the affixed devic