I'm running a Legend of Zelda inspired DND campaign and wanted to make a fun inventory system for my players. This is what I settled on. I took inspiration from the inventory system in Breath of the Wild and Tears of the Kingdom.
V1 PANEL INFORMATION The panels are designed with 15x15x2mm holes. The "chips" are sized at 14.5x14.5x1.5mm to allow for a little wiggle room so it's easy to take out of the panel. My 3d printer is not the best so if you have a better one, you could probably go with tighter tolerances. I plan on taping pictures of my player's items to the chips, which is why the chips are a little shorter than the holes. The blank spot at the top of the panels is added to give the panel a little dead space to put some sort of design, or in my case, PC names.
V2 PANEL INFORMATION The panels are now inverted, so instead of having small holes for the tokens to slip into, the tokens now sit on small humps. Similar to the old Rush Hour toy. They are also significantly bigger, as they're based on my attempts to create a customizable old-school Zelda dungeon system at DND 5e scale. Each token is now 1 in. x 1 in. as with before there is a spot at the top to allow for some decoration (in my case, player names)
Hopefully, this will be of some use to somebody! Feel free to let me know if you used it and what for!