The model is pretty self explanatory. I printed it bottom down in PLA+ and it's holding up quite well.
Please note that the lettering you see in the pictures, was added in the Prusa Slicer after the fact, with nice colour change. Because of this colour change, the tips of the brush holders also turned white, which helps to align the brush heads when placing them in the holder.
01-dec-2023: I've added a version 2, with sturdier and shorter holding pins. The pins on version 1 could break with PLA
The author marked this model as their own original creation.