Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4893581.

are you stuck with muddy colours on your paintings, maybe the issue is not having a proper palette to mix with.

even better you get a little water reservoir to clean the palette , and brush with keeping your main water supply cleaner for longer.

https://youtu.be/DxY5bnpu0Q0

water color painting tray, quick design with some medium draft i may end up doing some casts of this so i can make it in a clear material if you have a resin printer this is a good model but on an fdm printer the layer lines are very noticeable however I printed this on its end so the layer lines all go along the length of it