Philippe Dubois Burr Puzzle Pieces

This is an interesting puzzle I saw at a friend's house many years ago and had a lot of fun solving it, so I decided to recreate in 3D and make it available for printing.

While other 6-piece puzzles only need you to slide the final piece in, this one requires a multi-step process just to fit the final piece, so I think this is a pretty hard puzzle to solve.

If anyone wants to know the solution, check the link below:
https://imgur.com/a/fpq9t7j