Heat the nozzle to printing temperature and try pushing filament through by hand; if that fails, a cold pull, a nozzle cleaning needle sized to the orifice or replacing the nozzle usually clears it. Follow the printer maker’s procedure, since the nozzle is hot throughout.
A clog shows as thin or missing extrusion, a clicking extruder or filament that will not feed, and it can usually be cleared in minutes.
Confirm it is the nozzle
Check that the spool turns freely, the filament is not tangled and the extruder gear is not grinding the filament. Remove the filament and look at its tip: a blob or a narrow, charred end points to the hotend.
Clearing steps, gentlest first
Push through by hand at printing temperature, feeding filament into the hot nozzle. Cold pull: heat, insert filament, cool to a lower temperature, then pull firmly so debris comes out with it. Cleaning needle: a needle sized to the orifice, used carefully from below while hot. Replace the nozzle if it is worn, damaged or keeps clogging; nozzles are inexpensive.
Safety while doing it
The nozzle and heater block are hot, and the printer maker’s procedure for heating, handling and changing nozzles applies. Some quick-change nozzles must only be removed as their maker describes.
Preventing the next clog
Keep filament dry and dust-free. Use a hardened nozzle for abrasive filaments. Check that the hotend fan runs, because a cold side that warms up causes heat creep. Keep the printer’s retraction settings sensible, as excessive retraction can pull molten plastic into the cold zone.
Questions makers ask before buying
What is a cold pull?
Filament is pushed into the hot nozzle, the temperature is lowered until it is soft but not liquid, and the filament is pulled out, bringing debris with it. Guides from printer and filament makers describe the temperatures to use.
Why does a nozzle keep clogging?
Common causes are heat creep from slow printing or poor hotend cooling, wet or dusty filament, abrasive filament wearing the orifice, or a gap where the nozzle meets the heat break.
Last reviewed 15 September 2026