NutsnBolts Puzzle

Another puzzle from out of nowhere. :-) This shape caught my fancy so I crafted a puzzle out of it.
It's merely a cube and a pole with a perpendicular hole in the cube to accept the pole from another piece. (Get your mind out of the gutter, folks.)
When assembled correctly, eight pieces will form a 2x2x2 cube. It's really simple, and a great toy for kids, but it amazing how many people will start to assemble it then have to back up and redo some pieces.
The STL is the 8 pieces required to make a cube while still fitting on my meager 4" bed, but if you want to make many more, there are a ton of other structures to be made.