Needed Rafter Hooks for my Garage so I decided to design and print them. 2 of the hooks (ones in the print profile) held about 200 lbs/90KG before they finally broke. I actually scaled the hooks in half (not uniform) and it was still enough for My Bicycles.
Strength could likely be increased by adding walls/infill but I wanted to minimalize the filament needed for my personal needs.