An adapter to fit a Duco ventilation remote control module (its own frame removed) into a Bush Jaeger frame. There is no need to make a hole in the wall. In my case I replaced the frame for one switch with a frame for two. One half covers the existing switches, the other half is just laying on the wall and is used for the remote.
Prints in 4 pieces to make the gentle curve on the front the prettiest.
Optionally the prints can be connected with short pieces of filament.
Optionally you can fix the remote with double sided tape to the wall. In my case that was not necassary.
The author hasn't provided the model origin yet.