This is a little ball and socket swivel mechanism designed to be hung from a ceiling fan via a loop of rope. I designed this to hold cabling out of the way for my VR headset. See the picture.

This design can be used in lots of other ways too. :) It's print-in-place, so you can just twist the hook and it'll come loose!

Notes: I highly recommend a cooling fan if you're using ABS, as there may be issues printing this without supports with ABS.