Dark Squirrel Designs (@DarkSquirrelDesigns) at Printables created a great brush stand that holds small to large brushes. Most of my brushes are pretty small for mini painting, so I remixed it to add significantly more smaller brush spots while keeping a row for medium sized.

Print the top, bottom, and two sides. I also recommend checking out his Paint Brush Dryer (for "The Beast"): https://www.printables.com/model/422393-paint-brush-dryer-for-the-beast which is an addon to the side of the stand.

I printed this pretty light, 8% infill. You may want to glue the sides on as their fit is pretty loose.