Cartesian Diver featuring Makerbot's AQUABOT

Print and assemble this cartesian diver, named after famed French philosopher, mathematician and scientist Rene Descartes.
Demonstrating the mechanics of buoyancy and the ideal gas law, this toy has fascinated young and old for hundreds of years.
In addition to your printed parts the only materials you'll need is a balloon, an empty large soda bottle and some glue.
The only tools you'll need are a bowl, some sandpaper and some scissors.
It makes and entertaining and attractive demonstration piece and a great gift.
Theres a full video on how to construct Aquabot on youtube at http://youtu.be/5lzMfchYDaM
The Cartesian Diver strikes at the heart of "Make it Float" dealing with the physical property of buoyancy and a significant example of how it finds application in the real world. When I first pondered entering the contest, I became intrigued by the underlying physical property that allows items that are actually denser than water, to float upon it. A little research an