Speaker box for a 80mm (diameter) speaker.
How to built it:
These inserts need to be melted into plastic after printing the case.
Inside the case is a small hole, for the cables of the speaker. The hole goes out of the back and can be closed from the inside with a small amount of hot glue.
The distance from the M4 speaker screws are the following: 64.5mm
The result is very good.
Happy printing