Patent ID: 7744364

Claim:
A tip cleaning assembly for use with an extrusion head of an extrusion-based layered deposition system, the tip cleaning assembly comprising: a support component configured to be mounted in a build chamber of the extrusion-based layered deposition system; a purge ledge assembly mounted on the support component, wherein the purge ledge assembly comprises: a first surface configured to extend at a first angle relative to a horizontal plane when the support component is mounted in the build chamber; and a second surface configured to extend at a second angle relative to the horizontal plane when the support component is mounted in the build chamber, the second angle being shallower than the first angle; at least one set block adjustably mountable onto the support component adjacent the purge ledge assembly; at least one mechanism configured to adjust a height of the at least one set block relative to the support component and to fixedly retain the at least one set block at an adjusted height in the build chamber when the support component is mounted in the build chamber; and at least one contact head removably mountable onto the at least one set block, the at least one contact head being configured to engage at least one extrusion tip of the extrusion head.