The summer is hot and I am very lazy. I found a lot of small string puzzles in my puzzle storage box. This puzzles are easy to make. I made this puzzle long time ago with very limited workshop possibilities. I bought wooden balls from a craft store. The rod that connect two ball is 10 mm round ready stock. And I made for wooden ring from a wooden dough roller. The aim of this puzzle is removing the ring.
If you want make your own puzzle this small drawing can help you for dimensions.
If you can find wooden beads, you can cut wooden round disks and you can make a puzzle looking like a barbell. This may be a different and nice design.
DIY Puzzles 
Wow! This is nice. I shall try to make one for myself and solve it. 🙂
More devious: show the solved state with the ring off but the two pieces still connected! Then it appears that the ring can be removed without disconnecting anything.
Thanks for this nice idea, you are right this may be more confusing.
Looks like fun to make as well as to figure how to remove the ring. One of my hobbies is to collect, build and work wood puzzles.
Thank you,
Daniel