This is my design for a box to house a hobby built digital carb synchroniser. I have made mine from 3mm acrylic and a prototype from 3mm MDF. It may also be possible to make with 3mm ply.
The fit is very snug. I have glued all of the sides to the back with UHU adhesive and left the front loose - I might fit a hair band around it just to keep it in place but the laser cut is so precise it really doesn't need any extra fastenings.
This box is for this project:https://digitalcarbsync.com/
I cut the acrylic with 100% power at about 6ma, 10mm/s and with 4 passes on my machine.
Initially designed in Fusion 360 but then modified in Lightburn