The extruder barrel (also called throat) guides the filament in an aligned manner into the nozzle. The barrel is screwed into the extruder core
(where the heater cartridge
is located) until it reaches the thread of the nozzle
. This way the entire duct is sealed and protected from leaks at the joint.
It is 26mm long and has a M6 threat, therefore it is compatible with the E3D v5 extruder
, but not with the E3D V6 extruder.
The inside of the barrel can be lined with a PTFE tube which prevents from obstruction in case the filament gets welded to the metal due to excess temperature and makes the filament feeding easier due to the low friction coefficient of PTFE .