Chiasma puzzle

This is a puzzle by Yavuz Demirhan from Turkey that is normally made of metal. It's a very simple looking puzzle but very difficult to take apart and to put back together. I like this puzzle because although you can see the pieces the solution isn't made obvious through seeing all the pieces apart. This lets you still get the mystery of solving the puzzle even though it's not assembled to begin with. Print this same piece 4 times and you are good to go. If your print is too thin it should still solve just fine. If it is too thick you will have to sand it down to the correct thickness. I don't see why the puzzle couldn't be scaled up but I haven't tried it.