My wife asked me to make her something to help make it easier on her when she paints her cookies.
The food coloring containers are 25mm (5 holes on each side).
Due to the nature of the food coloring (and paint), I got a washable paint tray from Michaels.
https://www.michaels.com/product/10-well-paint-palette-with-lid-by-craft-smart-10194225?michaelsStore=2016&inv=6
When you finish the paint tray, you will need to put a wedge of some sort (spatula worked well just to push in and break and bits of stuck filament loose). Do not print with supports. There is a 4mm gap between the hinges and you will get an error about it but it's ok to print without supports.
I haven't had any issues yet with the paint brush holders snapping due to the print orientation but I made redesign it for better print orientation to make it hold up better over time.
I also took some design inspiration from https://www.printables.com/model/629678-vertical-paint-brush-holder and used Brad's concept but made a bunch of tweaks.
The author marked this model as their own original creation.