I saw this in a store but with double sided tape. That meant that each brush you have would require a new clip.
Some magnets and 3D printing later and voila.
I used 2 magnets that you can just pres-fit in. 9.5x3.2mm and 25.4x3.2mm
PaintBrushHolder.SLDPRT | 284.5KB | |
PaintBrushHolder.STL | 42.7KB |