Puzzle - opening the lock with a key

This puzzle of opening the lock with a key is not so difficult, even children can handle it.

You need to push the key through the ring until the very end. No need to use force. If the key cannot be turned, go back a few teeth and try a different route.

Print properties:

• The layer height is 0.16mm so that the small teeth of the lock and key are well printed. 
• The infill value 10-15% is enough.

Build:

• Use instant glue. Glue the key and its other reinforcing side together. Pay attention to the correct orientation of the reinforcing part.