Can Hold:
Can be printed with either just the base, for general desk storage, and for easy access, or with both the lid & base for a fully enclosed carrying case.
The mechanism to connect the 2 sides is a simple single tongue and groove joint, which only sticks out from the lid of the container, if you choose to print it. It is flush with the surface of the base piece once put together.
You can store the lid below the base if you want it to remain out of the way after you've taken the lid off.
In the future, I will attempt to make the form factor a bit cleaner, improve the fit of cards in the slots, and add a few variants for different amounts of cards.