Basic card box, fits Dragon standard sized sleeved cards fairly snugly. Pairs well with dividers that you can print at 100mm by 66.5mm. They'll stick up about 10mm taller than the sleeved card, which is perfect for label text. The box fits nicely on my build plate, I don't use a brim or raft, and it stays down well. Same for the lid. Either (or both) can fit with a default setting skirt.

The lid stays on quite well in my prints, but is quite easy to remove. Due to the shape, pressure from the inside deforms if very slightly making it grip more tightly, but lifting at either end takes it off quite easily. To put it on I recommend sliding one end on, than putting the other one one, but you can also just slide it straight down pretty easily.