Simple pegboard mount to fit Ryobi Medium Bristle Multi-Purpose Cleaning Kit (#A95MP1), hopefully should hold other bristle type sets as well, once I get the others I will be happy to update. It holds the brushes at an angle for easy mounting. 

The pegs print separately and are simply glued in the slot with your favorite adhesive. I used CA glue and activator and it's held up beautifully. 

Just keep in mind, I have zero training in CAD design and slapped this puppy together in TinkerCAD.