https://www.tactixtools.com/productinfo-2342.html
https://www.tactixtools.com/productinfo-2356.html
I got these for hardware, but they needed more sub divisions. You can mix and match to add more subdivisions as you please. I can fit all of my M3 hardware in one tray now, and am working on condensing other hardware and small items in to less space.
I have made them snug and tested them by turning the whole thing upside down and it is usually enough to keep all of the things in their bins, maybe some thin washers might escape, but nuts and everything else stays put.
The author marked this model as their own original creation.