LIQUEFIER ASSEMBLY FOR USE IN EXTRUSION-BASED ADDITIVE MANUFACTURING SYSTEMS

摘要

A liquefier assembly (62, 162, 262, 362, 462, 562, 662) for use in an extrusion-based additive manufacturing system (10), the liquefier assembly (62, 162, 262, 362, 462, 562, 662) comprising a downstream portion (62b, 162b, 262b, 362b, 462b, 562b, 662b) having a first average inner cross-sectional area, and an upstream portion (62a, 162a, 262a, 362a, 462a, 562a, 662a) having a second average inner cross-sectional area that is less than the first inner cross-sectional area, the upstream portion (62a, 162a, 262a, 362a, 462a, 562a, 662a) defining a shoulder (88, 188, 288, 388, 488, 588, 688) configured to restrict movement of a melt meniscus (94, 194, 294, 394, 494, 594, 694) of a consumable material (90, 190, 290, 390, 490, 590, 690).