Hook to open/close roof windows.

On the picture, the hook is attached to a wooden broom handle.

Printed with PET from pepsi bottles, 15% honeycomb infill, it don't bend nor break on use. It may break with PLA or bend with ABS at least with low infill, I believe that PETG can be a good choice. 

Feel free to give me feedbacks if you're printing with other material than PET.

Organic support, disabled support on the inside to prevent unnecessary trees to be printed.