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A hotend is a component used in fused filament deposition 3D printers. Its purpose is to heat up and melt filament material for depositing into the intended shape. The hotend is usually made of a bulk heat-conductive material with an internal resistive heater , coupled with a thermistor for precise temperature control.
There are several types of 3D printer extruders. A Bowden extruder is a type of extruder that pushes filament through a long and flexible PTFE (Teflon) tube to the hot end. [1] An alternative type of extruder which is also widely used in filament 3D printers is the direct-drive extruder, which sits closer to the extruder hot end.
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The thermoplastic is heated past its glass transition temperature inside the hotend. The filament is extruded and deposited by an extrusion head onto a build platform where it cools. The process is continuous, building up layers to create the model.
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