Plate adapter from 3 modules to two modules for concealed flush-mounted electrical box

I have done this adapter to adapt a 503 box was provided for the thermostat while the chosen and purchased thermostat requires a 502 box.
Not wanting to see "adaptations" I created a base that completely "closes" the 503 and leaves space for the 502. By doing this it is possible to completely plaster the adapter and you will not see anything once the thermostat has been mounted. To improve the adhesion of the wall putty and to prevent it from sticking, I created many small misshapen protuberances in order to create grips (in the photos I haven't done this yet...).

I hope this simple "tool" is useful to you.

Good print!

If you found it useful, and if you like, you can offer me a coffee!, it will be an extra motivation to continue designing.