ETH Zurich recently won the Design Innovation Award at Germany's Concrete Canoe Regatta for the third time in a row, thanks to a digitally designed canoe made from cast concrete. The intricate formwork of the canoe was first 3D printed in PLA and then cast, using a design technique called Free Formwork. ETH Zurich told us some more of the technical details about the canoe's fabrication, which you can read about at 3DPrint.com: http://3dprint.com/178972/3d-printing-concrete-canoe/