round screw boxes

I present another box for screws in the block of the cylinder contains 12 containers with an internal removable organizer for bits. All this is twisted with 4 M3 threaded rods. Washers are inserted at the bottom and top and between the levels. All elements were printed from PLA filament from the same manufacturer. They fit quite tightly, and I noticed that filaments of the same type, but from different manufacturers, shrink differently.This box can be used for various small things, the question is how to arrange the middle organizer. If anyone has an idea, I can implement it.