Selective Inhibition Sintering SIS is a new method of building 3D objects using powder sintering. The method is capable of making plastic as well as metallic parts without the use of laser. An Alpha machine has been constructed and preliminary studies have been carried out to prove the concept and to explore the process variables and their impacts. Various polymers including polystyrene and polyester have been successfully used in our experiments. Our preliminary results on metals have proven the feasibility of our approach for fabrication of dense copper parts with minimal deformations and without need for further impregnation. The approach should be feasible for a variety of polymers and metals. § Slide presentation of SIS § Animation of SIS process § Video § Technical Articles 1. Rapid Prototyping Journal Article, 2003 § News Articles Business Week Science Daily MIT Technology Review