These are box inserts for this 25 compartment Amazon Basics parts/tool organizer:
Since the selection that it comes with may not suit you perfectly, you can just print your own box inserts.
Especially good for FTC teams to store all of their hardware. We are FTC Team 15371.
The stl files here have more rounded corners than those that are shown in the photo.
The walls are only 2mm think, so I suggest 100% fill