My Living Room Light switch was behind a shelf after rearranging the furniture, and I did not want to change the electrical wiring. So I made this dummy offset light switch to work the one that is behind the 
shelf mechanically. Works really well for me.

Design based on the Busch+Jäger Light switch series that we have around the house anyways. 

Prints without support, afterwards add 2x zipties or some wire to connect the parts and glue them to the wall in the right position.