Can't press any buttons no matter how hard you shake the case, therefore protects the fragile switches when carrying the mouse in a bag.
Logitech is using bad quality switches on this mouse (google: G604 double-click) which break even when using the mouse normally on the table (I'm on my second mouse in 6 months). I wouldn't dare to put this mouse in a bag without a case.

Fits together using friction and comes apart easily.

Print settings:
0.2mm PETG Quality preset
5 layers top and bottom
Turn on Detect thin walls
Avoid crossing perimeters (when using Prusa mini)