Sonoff touch extension for people that have old houses where we still rely on those horrible inwall box with claws instead of screws....

I should have made the holes for the screws with a groove for the head but I was in a hurry. Works well enough.

Print the template, wire your Sonoff then level it and mark the place for holes. I used regular N6 electric dowel (please tell me if it's the right word for "cheville"). Easy enough and worked for me.

Creality

CR10S PRO

Normal

10%

Print it twice. 10% is a bit cheap, you may want more to make it look sturdier but I was fine with 10.