Fancy card holder that can be expanded indefinitely by stacking! How high can you go??

Each module fits 5 cards, from regular sheets of paper to business cards.

Print at least one base (``card_holder_base.stl``), then any number of stacks (``card_holder_stack.stl``).

No supports required, however I'd recommend ~5mm of brim around the stacking part due to the small footprint.