Height/depth stand for tabletop

I was helping friend DM to prepare stands for underwater D&D session, where players were supposed to swim and fight on a various depths.
This is the solution I came up with.

### Assembly:
To get one stand you will need:

* 2 printed parts
* M5 threaded rod, or anything similar with 5mm diameter. Cut it 1cm shorter than desired height, due to thickness of a model inside
* 4 round magnets of 5mm or 8mm diameter and 1-2mm height
* Some glue

Both magnet sizes work pretty well, yet I've found 5x2 to be the best solution for stands up to 15 inch high, which is, for standard D&D grid scage is 75ft.

Glue is supposed to be applied to rod, inserted into parts, as well as to magnets. All parts were pretty tight fit in my case, glue was just to be on the safe side.