HTC Vive Controller Bumpers

We regularly give demos with our HTC Vive, and found that people who are not used to VR tend to reach past the chaperone on a regular basis. This would result in people smashing the controllers into the wall.

We started by using the Vive controller protectors created by [Kf52t](https://www.thingiverse.com/Kf52t/about), but found that they typically broke near the center. Usually destroying the entire print. We were swapping them constantly.

I ended up rebuilding the entire model from the g