This is a modular storage system designed for organizing small parts such as screws.

There are two sizes available: a square container (45 mm × 45 mm) and a double-size container (45 mm × 90 mm).
You can print as many containers as you like and connect them together.

Labels can be placed on the top. In the photo, the label width is 12 mm.
The inside bottom edges are filleted, making it easy to pick up the parts.