Extremely hard jigsaw puzzle

Let it be clear that I didn't come up with this puzzle, I just made it a 3d model. I'm not smart enough to come up with something as genius and outside-of-the-box as this puzzle. The puzzle has 9 pieces. The goal is to fit all pieces flat inside the frame. And no, I'm not showing the solution. It is extremely difficult. Chris Ramsay did a video on solving this puzzle, so if you need help watch this video- https://www.youtube.com/watch?v=s4EcAQGNn6M
I enabled ironing to make my surfaces really smooth. This increases the printing time, though, so up to you.
DO NOT COMMENT THE SOLUTION! It has 0.3 mm tolerance. I increased the tolerance on the border as people were struggling with it. Enjoy!