Theta 3D Printer - 4 Simultaneous Printing Extruders

Here is an interesting machine which is part of the HackaDay Prize competition. It's created by a man named Tyler Anderson and it uses a polar coordinate system of printing. The machine, called Theta uses 4 extuders printing on a rotating circular base. The extruders can all print simultaneously, making this machine quite the work horse. More details on this amazing 3D printer can be found here: http://3dprint.com/13310/theta-3d-printer

Below is a picture of the incredible machine. What do you think of the Theta 3D Printer?
http://3dprint.com/wp-content/uploads/2014/08/the.png

If this could be a little more refined I certainly think he's onto something. Imagine a massive scaled up version of this machine, so 20 times the size with 80 extruders. That's would be one heck of a mass manufacturing tool.

lol hell it's bad enough calibrating just the two extruders. Not sure I'd want to do 4.

The whole spinning plate idea is interesting though.