Well, it's a drying tray for sponges!
I needed somewhere to dry the sponge I use for cleaning my print beds so why not design one myself? It's great CAD practice and I can make it exactly the way I want.
It's designed to maximize airflow across the water in the tray to evaporate it as fast as possible. It does this with large gaps in the tray to allow air through. There are also small corner stands in the tray to ensure the smallest amount of area to trap water between the rack and tray.
It's also very easy to take apart and clean in case something... well... icky gets into the bottom.
3d prints have micro-cracks that trap bacteria so care should be taken when used around food.
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Check out this drying tray I created for those!
https://www.printables.com/model/1091698-spongemonkey-scrub-daddy-drying-tray
The author marked this model as their own original creation.