Hotend

The hotend is the part of the extruder near the nozzle, here it is the lower part of a direct-drive extruder

A hotend is a component of 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 or thermocouple for precise temperature control. In common desktop 3D printer designs, the heater is located near the nozzle, and a heatsink is attached upstream (on the colder side). A heatbreak component made of dissimilar metals (bimetal) can be used to limit heat transfer to the cold filament above, increasing the controllability of the melted filament.

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