15mm Camera rail adapter for DSLR rig

I recently broke one of the hand grip 15mm rail adapters on my DSLR rig, before I spent $60 on a replacement I thought I'd see if I could print out a replacement. I also added a cold shoe adapter to the top of the hand grip. This makes it easy to add a shock mount, LED light, or any other random film gear to the top of the handle.

I designed this around the left over parts from my original handle which used 1/4 20 square nuts and thumb screws. Square nuts are kind of hard to come by so you m