CR-10 Integrated Octopi

This is a project that my son and I did. It was inspired by:
https://www.thingiverse.com/thing:2481483
(the io shield is actually just his brought over ... no need to redesign that part.)

However, we wanted the Pi to control the fans as well as the printer power.
I'd love to say we carefully measured the hole in the case, but reality is that we placed the mounted pi in place, marked one corner (above the USB port) on the inside, cut through, then used that as a reference to cut the 54x20mm