MTO's Installation Box Extension

This is an extension of standard (in Sweden any-ho) electric 73 mm (60 mm CC) installation box. The one you mount light switch, dimmer, electric socket, thermostats and communication jacks etc.
It is 13 mm like standard construction plasterboard. I just printed 7 pcs that will be used tomorrow and they seams to work fine when tested. Way easier than using the extensions I found and loads easier to take down old boards and re-do the whole wall.

There is two ways to mount this.
1. Screw the e