A clicking or skipping extruder produces audible clicking sounds as the drive gear repeatedly slips against the filament. This indicates the extruder cannot push filament through the hotend, leading to under-extrusion or complete print failure.
Common Causes
- Partial nozzle clog — Debris or carbonized filament restricts flow through the nozzle
- Nozzle too close to bed — Excessive squish creates back-pressure the extruder cannot overcome
- Print temperature too low — Under-heated filament resists flowing through the nozzle
- Filament grinding — The drive gear chews into the filament, losing grip
- PTFE tube degraded or misaligned — A gap between the tube and nozzle causes filament jams
- Excessive retraction — Too-long retractions cause repeated heat zone jams
Recommended Fixes
- Perform a cold pull to clear partial clogs from the nozzle
- Increase nozzle temperature by 5-10°C to improve filament flow
- Raise Z-offset slightly if the nozzle is too close to the bed
- Check and replace the PTFE tube if it is worn, charred, or not seated flush against the nozzle
- Reduce retraction distance (Bowden: max 5mm, Direct Drive: max 1.5mm)
- Reduce print speed to lower the volumetric flow demand on the hotend
- Inspect the extruder gear for wear and clean out any ground filament debris