MultiClip caliper holder

I liked the general design by Franks3dShop and it also happened to nicely match the size of my calipers but I needed one holder for a metal board and one for hot gluing so I remixed the original design for a more universal [MultiClip](https://www.thingiverse.com/thing:2747516) attachment.
For versatility I included 3 MultiClip attachment slots. In reality you will not need more than two at most to create a very stable fixture.
While I edited it I also found it appeared a bit bulky so I made it