Yube Cube: Rear Connector

I have a bunch of [Yube Cube](https://yubecube.com) around my house but the rear connectors I bought keep breaking and they are somewhat expensive online and take a while to ship. Enter a custom design that I can 3D print out.

I ended up making some improvements including two thumb wings to allow you to take these connectors off much much easier. Most of my original connectors broke from just taking them off.