The box is a remix of https://www.printables.com/model/258431-rugged-box-parametric where I adapted the dimension parameters to fit the need for a 9mm ammo insert.

The insert is a bit loose on purpose, since one with a snug fit would be hard to take in and out… I use the tray for reloading, and it made sense to make it small enough to drop in and out.

(I turned the writing the right way on this one, compared to the pictures)