About this 3D model

This is a tricky 4 piece puzzle based on a squashed cube building block. The pieces are required to be put together in a set order and lock into position once finished. As a designer I still find putting the puzzle together tricky. The design was created after automatically checking thousands of computer generated designs. The design process in Fusion 360 can be seen here https://youtu.be/CkOa-mQD3Bg