Two different styles of vented lid you can 3D Print to fit a 2 5/16x 4 3/16 Amac Box. This is meant as a convenient way to turn them into enclosures for small animals without drilling holes in the acrylic boxes. The front face is intentionally solid to leave room for a label.
I don't have files for it currently, but I'll also be making a reverse lip design so that the lids from the Amac boxes can be turned into even smaller enclosures and not be wasted.