This is a set of storage boxes for end mills.

The format of the boxes is 150 mm x 85 mm, the heigtht is the max. diameter of the end mill plus 2mm.

So for 12mm end mills the hight is 14mm.

I added the FreeCAD files, too. So if you want to create smaller / bigger ones you can just change the model and create a next export.
It would be great if you could post me your modification, then I could add it here.