This spacer is designed for mounting controlled light switches (Sonoff T4: https://www.itead.cc/sonoff-t4eu1c-wi-fi-smart-single-wire-wall-switch.html ) and is particularly useful if your Patress boxes are set too low. Using a spacer can make it easier than cutting brick or plasterboard for a deeper Patress box.
Spacers are available to purchase for a small fee from a DIY store, but if you need a black or 20mm depth that is not readily available then this spacer could be the solution. In addition, you can always customize the design if you need to.
In this pack we have included 10, 15 and 20mm versions as .stl files.