Patent ID: 8815141
Filing Date: 2014-08-26
Classification: B29C,B33Y

Abstract:
1. A method for building a three-dimensional model with an extrusion-based additive manufacturing system having an extrusion head, the method comprising: depositing a consumable material from a liquefier assembly of the extrusion head at one or more extrusion rates while moving the extrusion head along a first portion of a first generated tool path; reducing the extrusion rate from the one or more extrusion rates to a slower, constant extrusion rate at a predetermined point along the first generated tool path, the predetermined point being before an end point of the first generated tool path; depositing the consumable material from the liquefier assembly at the reduced, constant extrusion rate while moving the extrusion head along a second portion of the first generated tool path, the second portion bounded by the predetermined point and the end point to substantially normalize a meniscus height within the liquefier assembly before or upon the extrusion head reaching the end point of the first generated tool path; moving the extrusion head to a successive-layer tool path while substantially maintaining the normalized meniscus height and without performing a purge operation; and depositing the consumable material from the liquefier assembly while moving the extrusion head along the successive-layer tool path.