Applying the well-known so-called "Archimedes' Paradox" is built electric power generator.
operating principle:
http://www.slideshare.net/bulgakovatanya/argenarc
Most of the parts made in the 3D printer, ABS, except for two water pumps, pipes and metal parts for the generator.
We used a 90mm acrylic tube height 1000mm. You can use pipes made of any material. Pipes is better to choose a smaller diameter.
The bottom part will be published later.

Rafts: Doesn't Matter

Supports: Doesn't Matter

Infill: 0,15