Junichi Yananose's Interlocking Cube #2 recreated with Puzzlecad. Published with permission from the author.

http://www.polyhedra.jp/puzzle/interlocking_cube02_01-j.html

Make a 4^3 cube out of the eight pieces. It is a very tricky puzzle, I had to look up a hint after many hours of trying. And even knowing which two pieces to start with, it took quite some effort to figure out the correct order from there!

Check out the rest in the series: https://www.thingiverse.com/akaki/collections/yananose-interlocking-puzzle-cubes

https://youtu.be/wzTT27i8TQQ