Door or Windows Frame Hook

Hook to hang things on a door, or on a window.
The part that goes behind the frame must be thin (2.5mm) so that the door or window can be still closed without issues. This part is the widest. The hook of course is not that wide. It instead has a substantial vertical thickness.

Print placed on one of the slanted sides. They are perfectly flat.

The backlight photos show unexpected patterns, caused by the crosshatch infill against a slanted wall.