Summary

Couldn't find a big hook I liked well enough, here on Thingiverse, so I created this one just because it's a pleasing shape.
There's not a flat plane on the whole part, so it's very difficult to 3D print nicely because it requires a lot of support to print, no matter how you orient it. For that reason I split it in two so the two halves can be printed very easily, with no support, and then glued together.
I've provided the file(s) both ways.
It's also about as big as I can possibly fit on my prusas, but easy to scale down to any size you like.