This is box I made for datalog- tool. 

Outside 190mm x 90mm. 4mm walls. 

I used PETG with 25% gyroid infill. 

It is sturdy and will hopefully last long in use.

Use supports for hinges and latching mechanism. 

For hinges you need 3x 30mm m3 bolts. Seems to be fine without nuts, but there is room for them too in 30mm. 

Feedback welcome.