I designed this print rack after I saw this haxagon design from other makers. I decided to make my own version because I wanted it to be more flexible and modular. You can print all the parts you need and can create your own paint rack (and then add holders for stuff you bought in the meantime).
I only made 2 caps so far for citadel paints and my brushes, but you should be able to easily remix your own caps for anything you might need.
Disclaimer: It is still a work in progress, like the clips are very thin and delicate, but it all works fine if you don't move the whole rack around that often.
The author hasn't provided the model origin yet.