Open Source Powder-Based 3D Printer
"The University of Twente, the Netherlands brought their Pwdr Model 0.1 to the open source community, an open source powder-based rapid prototyping machine.
Its goal is to promote experiments and innovations in powder-based rapid-prototyping. The machine is ready to use both the 3DP as the SLS process with minimal adaption, although the printer is currently prepped for 3DP.
A wide range of new materials become available for experimenting with open-source rapid-prototyping; for example, when using the 3DP process: gypsum, ceramics, concrete, sugar, etc. And when the SLS process is fully supported, plastic materials like ABS, PP, Nylon and metals become available as building material." (http://www.3ders.org/articles/20120803-first-open-source-powder-based-3d-printer.html)