Thanks for developing such great technology. I am looking forward to printing clay as well.
Idea: have you considered having the auger (and related parts) printed out of stainless steel/brass, glass or ceramic from shapeways? http://www.shapeways.com/http://www.shapeways.com/
They charge by the cubic centimeter, and based on the size of the auger, I bet you could them printed out of metal for much less than 125
Ã¢Â‚Â¬. I bet you could get 5 for that cost. Stainless steel prints are $8/cc3 and ceramic is only $0.18/cm2, and glass is $6/cc3.
Or another possibility would be to print the auger out of PLA, then do a lost-PLA metal casting.