This is a pure a simple one - I only had a 32mm hole saw to drill the holes in the back of my new enclosure - That was way too big but I figure, hey I have a 3D printer. Its prints quick, uses little plastic and does the job.
EDIT: Here is my Screwless Collection:
Ikea Pax - Screwless Collection by RandumbPrints | Printables.com
The author hasn't provided the model origin yet.