It's a modular spinning dice box holder/organizer, it fits 9 dice boxes per layer.

I already designed a different Dice Box organizer for the Chessex dice boxes, but I needed something that occupied less space and could fit the new larger boxes I bought. The old one is here:
https://www.thingiverse.com/thing:4284833

It has 2 different sizes, one for the Chessex Dice Boxes (3.8cm x 3.8cm x 7.1cm) and the second one for the Bescon dice boxes I bought on amazon (4.1cm x 4.1cm x 6.9cm). You can mix the 2 different sizes into the same holder.

It's really easy to build, all you need is to print 1 Bottom, as many Middles as you need, 1 Top, and if you want a Top Piece. Then you just stack then together.

I'm not sure how tall you can make it, I tested up to 4 full layers and it still works great.

I also suggest adding rubber feet to the bottom piece so it won't scratch the surface you put it on.

It's pretty easy to spin, and it can take a certain amount of force. I know it's tempting but if you try to spin too fast the dice boxes will fly off the holder.

The top pieces are not necessary but I like how they look. They're easy to put and to take out. One is a D20, the other one is a Dice Mimic. There's also an empty top piece in case you want to build your own. The designs on the top pieces aren't mine so here is the copyright:
For the D20 I used the model from Don42 (https://sketchfab.com/3d-models/d20-dice-w20-wurfel-3d-model-free-3b44541db43e4e979efec290ec706cbc) under CC BY-SA 4.0.
For the Mimic I used a combination of the D20 Beholder model from TheLDSMissionary (https://www.thingiverse.com/thing:4678669) under CC BY-NC 4.0. And the tongue is from the Chest Mimic Tongue from Zach Bolyard (https://www.myminifactory.com/object/3d-print-chest-mimic-tongue-164003) under CC BY-NC-SA 4.0.

https://youtu.be/JYDwEBakH3c