Billet Box Doors

I printed it with the flat side down. I use a PEI sheet and it gave them a pretty nice finish for the outside of the box.

The Billet Box uses 3mm magnets I used these https://www.amazon.com/gp/product/B076QB4NYP/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
They don't seem quite as strong as the BB magnets, however, hold fairly strong.
I made the mag holes 3.3mm so add some clearance for my printer. If you are using a CNC machine you may need them to be a bit smaller.

.f3d files added for all models