This is a simple wall box measuring 80mm x 80mm for the Shelly Plus 1PM to be wall mounted. It will work with Shelly Plus 1, Shelly Plus 1PM, Shelly Plus 2PM, Shelly Plus i4.

I modified it to suit my needs.  I do not need to use glands and the hole was increased to 20mm from the original 16mm.  My modification will not allow for the M20 gland nuts to be added inside if this is what you require.  If you would like this to be possible, let me know and I will modify it.

For screwing the lid onto it use 4 x M3 x 8mm counter sunk screws.

Included the original STEP files in case anyone wants to alter them.