paintbrush holder
thingiverse
Here's something I whipped up for a buddy of mine using Tinkercad, just to see what it could do.
Download Model from thingiverse
With this file you will be able to print paintbrush holder with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on paintbrush holder.