Raspberry Pi rail mount

This is a project im working on to rail mount a raspberry Pi. I use the Astrobox interface with my RPI2 for my 3d printing needs.

Current model I have not tried to print, I printed an earlier design that i wont be releasing but it had a different mounting system using a slide in triangle feature. This ended up failing on the mount; the RPI fits into bottom fine but the top is rather snug with how wide i have the holes on the lid (this could be an error with calibration on my reprap) Let me know if i need to adjust that.

The pillars on the base are short by design so that the lid doesnt lock down so tight to break them off. On other RPI cases ive printed this has been an issue for when the RPI is removed it breaks the pillars off in the top peice.