Chinese puzzle

This is a chinese 3D puzzle as I remember to have played when I was child. I don't know the story of this puzzle or if it is really a chinese one, but I know that with these three pieces you'll be astonished to see with how much difficulty people will assemble the figure! They'll think "hey, three pieces! That should be so easy!"... but when they have the three pieces in hands they struggle to understand how to insert them!
Try it by yourself :) This will be a wonderful conversation starter...

I designed these pieces so that they should be easy and fast to print, without any support.