ACME thread nut trap for Mendel

I have a pre-Prusa Mendel and my crappy threaded rod leadscrews seized up, so I decided to move to ACME threaded rods. After procuring some 5/16ths rod and hex nuts, I found that even though the rod was the same diameter as my previous triangualar threaded rod, the nuts had a larger outer diameter and wouldn't fit in the existing Mendel nut traps. So, here is a redesigned nut trap with the right dimensions for a 5/16 ACME thread heavy duty nut.

The original was done in Art of Illusion, whic