Outdoor holiday light hooks. My roof has a 15 degree angle, so there are angled ones provided. These are simple hooks that can be screwed into a bargeboard to run lights along the roof for the angled parts.
These were printed in PETG with supports. The screws I used that work with this were #8 x 5/8" wood screws.
There are also variations that have the screws on the bottom (the ones I used in the pictures) and screws on the top.
The author marked this model as their own original creation.