Simple PSU contact cover

The 12V PSU for my CobbleBot didn't come with any cover for the terminals, meaning the 110V supply was unprotected. I found quite a few different designs on Thingiverse, and the one I liked best was this: http://www.thingiverse.com/thing:51261 However, the AC supply was on the opposite side than what I needed. It was that designer's idea I used to create v2, which has a screw-down to one of the 12V V- pins. The original v1 uses a screw on the metal case of the PSU. I print it top-side down so it doesn't need any supports.