I found a huge CD rack at a local charity shop, as in revolving holding a ridiculous amount. I had seen a youtube video where someone used old CD racks to make adjustable “Shelves” for things, I will link him when I can find it again!
Originally I made one which was 3x4 but I'd made it basically so the paint would sit on the tray but was a bit wobbly. I tried to make some kind of additional support that didn't add too much to the print time or use a load more plastic, and I ended up redesigning from scratch and realised I'd mage the tray holes for the paint way too big, hence managing to increase the amount it holds by quite a bit!
Prints about 2hr 20mins according to Orca Slive on my Adventurer 5m in PLA +, which was 40 ish mins more than the previous one, but much better!
Anyhow, Hope its of some use to people, I'm working on GW paint one, and when i get other sized bottles will look into them too.
Feel free to remix this for your own needs, This will remain a free file but please attribute me if remixing!
Edit : I found the inspiration post! https://www.printables.com/model/807063-cd-drawers-volume-1 made by user @ChrisBorge, Thanks!
The author marked this model as their own original creation.