3d heating element without nub

A 3D printer’s heating block is the part of the extruder where the nozzle meets the thermal barrier tube. Contained within the heating block is also the heater cartridge and thermocouple. Typically made of aluminum, the part functions literally like a block of heat, melting the filament as it passes through the thermal tube to be extruded out of the nozzle.

The 3D extruder is the part of the 3D printer that ejects material in liquid or semi-liquid form in order to deposit it in successive layers within the 3D printing volume. In some cases, the extruder serves only to deposit a bonding agent used to solidify a material that is originally in powder form.