4Th International Conference on Advanced Research in Virtual and Physical Prototyping, Vrap 2009, Date: 6 October 2009 through 10 October 2009, Location: Leiria, Sponsors: The Polytechnic Institute of Leiria (IPL);The Centre for Rapid and Sustainable Product Development (CDRsp);Portuguese Foundation for Science and Technology;The International Academy for Production Engineering (CIRP);The Global Alliance of Rapid Prototyping Associations (GARPA);The Rapid Manufacturing Platform