Puzzle Box

I found this puzzle as a very old wooden version, but I don’t know who should be credited for its original design.

Goal: Fit all six pieces into the box.

Difficulty: Hard – this puzzle box requires time and patience.

No force is needed. If you need force, you’re on the wrong path.

You can scale it down by up to 50%, and the tolerances will still work.

The solution is included in the documentation.

Tip (if you only need a small hint): 

Have you tried rotating a pieces?