Patent 9233506 was granted and assigned to Stratasys on January, 2016 by the United States Patent and Trademark Office.
A liquefier assembly for use in an additive manufacturing system, where the liquefier assembly includes a liquefier tube, a nozzle secured to an outlet end of the liquefier tube, a heating element extending at least partially around the liquefier tube to generate a hot zone in the liquefier tube, a hollow spacer disposed in the channel; and a hollow liner disposed in the channel abutting against an upstream shoulder of the hollow spacer.