This a shelf/display for poker-sized playing cards. It is able to fit 8 decks of cards per shelf and is a modular design so you can stack as many on top of each other as you want.
modularShelf_ends: can be used with modularShelf_middle to make 3+ high shelves
modularShelf_middle: goes in between 2 modularShelf_ends so that it has the same width for each wall. (top and bottom walls are half-width)
modularShelf_2stack: is a complete shelf with only 2 shelves so you don't have to glue two of them together ( will fit on larger print beds laying on it's back, fits on my ender 5 if I set bed adhesion to off)
modularShelf_single: is a standalone shelf with the same width walls on all four sides. (wouldn't use this if you plan on stacking them as it would make the top and bottom walls between twice as thick as the side walls)
If you want to see any additional files let me know in the comments and I can probably add them.