This is a storage solution I created in order to store sleeved or unsleeved Magic: The Gathering cards (the bins are sized to fit any of the popular TCG cards however) in an IKEA Alex 9-Drawer Unit. The top 5 drawers fit 3 columns of cards hoizontally, and the bottom 4 drawers fit 4 columns of cards using the vertical storage trays. That said, these are also just useful for general storage.

Also included are the horizontal dividers I print (vertical ones I just use the numerous vertical-sized dividers you can find all over the place), and my sorting trays which are useful for pulling cards out of the collection or when sorting cards from a new pack.

I would recommend printing these in PETG as PLA and ABS/ASA are unsuitable storage mediums for the ink on cards (if you intend to store things unsleeved).

Credit to Zack Freedman for his Gridfinity System, who's stacking profile I borrowed for these boxes.

Also credit to tinyfluffs for use of their Fusion360 model for the original baseplate profile.