After looking for a place to place The Pool, I found Laurent's suggestion of a K&M 28075 stand to be the best solution. But everything in my studio is on wheels, so this stand needed to be adapted as well.
STL file for printing is here: http://data.bodyia.cz/kmholder2.stl (http://data.bodyia.cz/kmholder2.stl). Just slide it (forcefully) into the legs of the stand after removing rubber ends. The suitable screw are M8x60, the castors something from your favorite hobby market.
Bravo ;) What material (ABS, Hyper PLA, NYLON...) you use ?
Thanks, it way better now:) I think that I used PLA for this one, it is totally ok for home/studio environment.
I would be a little afraid with PLA but I saw that you have planned nice thicknesses ;)
For those who don't have a 3D printer, there are some serious sites that can do the job. The bodyia file is perfectly processed.
On a site like JLCPCB (https://jlc3dp.com/ for 3D printing), for NYLON 3D printing, the price per part is around ten euros, for PLA six euros for each sample.