This card holder is designed to be extended upwards (not infinitely, but it should be possible to go up a couple of levels safely)

If I find the time, I will extend it to have a turning crank that will turn the tower.

All parts should be printable without supports (the orientation might need to be changed in the slicer).

You'll need each part of the base once, and then as many holder-parts as you like (but maybe start with one and go from there ;) )

The wheel goes in the base (with the larger hole facing up), and then the lid is screwed onto the base. The holder parts are then just stuck into the hole at the top of the base.

I did not have time to print it myself already, but will post a make as soon as I managed to get to it.

As always, I am happy for any feedback or recommendations!