Here is a free scroll saw pattern that is easy to cut and lots of fun to play with. The Wooden Knot Puzzle is surprisingly difficult to assemble.I can't take credit for the design. I saw this puzzle on the Woodwright's Shop show. He cut everything with hand tools. I thought it would make a neat scroll saw pattern.
I put a short video together showing how to assemble the puzzle. Check it out below and have fun with it.