This 3D model represents a storage box with 48 compartments measuring 20×20×20 mm each. The overall dimensions are 178×134×22 mm. A 2 mm fillet on each compartment makes it easier to grasp the stored items.

This model was generated on iteration3d.fr. You can create an STL box with compartments that match your specific requirements. on the multi-compartment box page.

You can now also add colored rings on top of the compartments:
https://www.iteration3d.fr/en/templates/template-view.php?templateid=15