The speed of 3D printers using fused filament fabrication (FFF) technology depends mostly on the speed of the extruder. In this document we discuss the development of a cold end of extruder for a large-scale 3D printer. A presented process starts from the setting of construction requirements, go through the study of the partial functions of the cold end and finish with the evaluation of prototypes. Based on the estimates of partial solutions we create final prototype of cold end of extruder.
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