Interesting clay extruder build on thingiverse

This caught my interest.  A clay extruder that looks like it does not use a plunger approach.  Most of these builds have used a needle like plunger.  This one doesn’t and has an insteresting auger build (looks like a screw).  I’m going to have to keep an eye on this one.

http://www.thingiverse.com/thing:1413969