Hey, this model creates an illusion. It seems like both Parts should not be able to fit inside each other, but they do. This happens because our mind just fundamentally can't comprehend helical movement. Steve Mould made a great Video on that.

This concept has been done so many times and so many ways that I can't find out anymore who came up with it. If you do, please let me know so I can give proper credit.

Print Settings: Standard. No supports.

Enjoy and leave a like. :D