The present invention is directed towards methods and apparatus for handling powder in a 3D printer. The invention includes a means of transporting powder from multiple sources to a powder dispensing apparatus with minimal user intervention, thus reducing contamination of the 3D printer and surrounding...http://www.google.com.au/patents/US7828022?utm_source=gb-gplus-sharePatent US7828022 - Apparatus and methods for handling materials in a 3-D printer
