Screwy Screw

I found this video and wanted to make my own. One nut goes on right handed and one goes on left. All overhangs are 50deg so it should print without trouble.

http://www.youtube.com/watch?v=o-fPsvqjqZI&NR=1

Update:
In case you missed it in the comments, the original screw and video were made by VeryWetPaint (http://www.thingiverse.com/VeryWetPaint).