Backplane for a Giesse window handle, with stops for the three positions close/tilt/turn. I don't know the precise handle model nor the piece number.

Printing

You'll need 100% infill and a strong material. I tried PETG at 30% infill and it shouldn't break under a normal stress, but I was able to break it.

I used PETG/CF at 100%, but the CF part may be overkill.