This started off being a holder for attys/batts. I modified it to be an atty dryer.
I used a tablesaw to make saw kerfs criss-cross across the bottom to connect the holes. Glued 1/8" wood all around, and added a 1/4" barbed connector:
A piece of 1/4" latex tube and a cheap desiccant filter from
Harbor Freight are connected:

Hook it up to an air source set down to about 10psi, and, automatic drying! This one holds up to 24 pieces. I put unused carts in the holes not being used.
I use my air compressor, but a large aquarium air pump would work as well. The desiccant cartridge assures the air is dry and clean. Dries them bone dry in less than a few minutes.
Rick