Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5397561.
This is a paintbrush cleaner that you can attach to any mug. It is designed with a clip to keep it in place and it also allows it to be used on larger containers of water as well. I have included 2 files. One has the clip included and can be printed standing up with supports for the bottom of the clip. If you don't want to use supports or your printer has issues with skinny supports falling over the second option has the clip detached and you just have to glue it into place after printing in the small indent provided.
The lips on the two side pieces are excellent for wiping your brush/getting excess water off.
The example in the photo I printed was printed all in one piece.