Just a simple Stackable CD Organizer. It is modular so you can stack as many as you want.

It has really good rigidity (for the amount of material it has at least) however I created two different profiles so you can pick the one that suits you better:

• Without division: Less material/time. Suggested if you are not stacking or if it is going to be used for the last pieces in tower.
• With division: Better rigidity. I suggest to use this one for first tower pieces or if you just want to be on the safe side.

In my tests you can stack 2 fully loaded pieces over one (without division) with any issue what so ever, it doesn't bend at all.

You can use glue if you want to join two pieces, however in my experience the weight of the CDs should be enough to keep them in place.

I have printed 4 so far myself and they all printed nicely.