I wanted to keep my family from switching off the power to all our zigbee lights.
So made this to prevent it from happening while keeping the on off functionality sort of.
These work for both ELJO Trend and Biltema Art: 46905 and the likes.
1: Using an IKEA Trådfri on/off switch, remove the backplate and then remove the screw and plastic washer from the backplate.
2: attach the Trådfri base to the printed part, using the washer is optional but keeps the screw from falling out/getting lost. Also don't forget to add the battery.
see 2.jpg and 4.jpg
3:Add a bit of hot glue in the cut of the printed part, this is not needed if you printed the part with notches, but the hot glue one is a more snug fit.
4: attach it to your wall mounted switch and start using.
Printed face down on a glass bed to get the glossy finish, this is why I kept curvatures at a minimum.