Idea is for 3x5 index cards, which some people still use ;). You can put the card in the top in the slot so you can see it while you are making whatever it is. I made dividers foir the inside, it is a bit tricky since thin plywood is expensive, not sure what the best solution is. This time I made it with paper and a printer, using spray adhestive to glue to thin pieces of chipboard. I cut it on the cricut though and not the laser.
Used boxes.py to make the box: https://www.festi.info/boxes.py/HingeBox?language=en
Here is a link to the AI file on drive, since it is too big to include here. has images for the various dividers in there.