This type of bracket is typically used in boating but there are many uses around the house as well. Tying up and extension cord to your garage wall is the most obvious.
These print with no support. I printed mine 0.2mm, 20% infill.
The ball prints inside of the holder to save space if you want to print multiple holders.
You can scale it up for larger applications.
I used 18 gauge electrical cord (zip cord), split down the middle. I found it has good abrasion resistance and strength.