Swivel S Hook

I did this quick remix as I couldn't get the original to work as a print in place. I also resized it to fit the more standard American closet rod, about 1.25" in diameter. The main piece will be slightly joined and can be worked apart with some gentle back-and-forth rotating. It can be glued together either using CA glue or a Methyl Ethyl Ketone type hobby glue if you are using PLA. If you use CA, I would keep that on the hanging side and use the solid printed one on the rod side as it has the flex significantly to fit over the rod.

The pins may or may not fit depending upon the tolerance of your printer. They aren't really necessary, and you can pretty much jam anything in there if you feel a need.