I made this box for my external M.2 SSD enclosure, it has 5 mm mounting foam tape inside to protect the SSD.

Enclosure is Transcend's TS-CM42 M.2.

Inside dimensions are 42 mm x 15 mm x 90 mm.

The step files are included so you can modify it according to your needs.

EDIT:

I added the parametric design of the Box and Lid so you can modify it according to your needs, the file was last updated in FreeCad V1.1