A "clicking" or "ticking" from the extruder almost always means: The motor is trying to push filament but can't advance it. It skips steps (step loss) or the drive gear slips.
This is not a normal sound – it's a warning sign.
📌 What the problem typically looks like
Clicking or ticking while printing, underextrusion, gaps in layers, irregular lines – the extruder is not feeding reliably.
🔎 Main causes & solutions
1️⃣ Partially clogged nozzle
Symptoms:
- Clicking while printing
- Underextrusion
- Gaps in layers
- Irregular lines
Why? Dirt, burned filament or temperature too low blocks material flow.
Solution:
- Increase temperature by 5–10 °C (test)
- Perform cold pull
- Clean nozzle with cleaning needle
- Replace nozzle if needed
💡 Pro tip: Cheap or dusty filament often causes clogs.
2️⃣ Print temperature too low
Symptom: Clicking especially at high speed.
Why? Filament doesn't melt fast enough → backpressure increases.
Solution:
- Increase temperature
- Reduce print speed
- Check volumetric flow
3️⃣ Print speed / flow too high
Symptom: Clicking only during fast moves or thick walls.
Why? The extruder is trying to push more material than the hotend can process.
Solution:
- Reduce speed by 20%
- Calibrate flow
- Respect max volumetric throughput of hotend
4️⃣ Clogged PTFE tube (Bowden systems)
Why?
- Tube end melted
- Gap between nozzle and PTFE
- Incorrect assembly
Solution:
- Cut PTFE end clean and straight
- Assemble hotend correctly (tighten nozzle when hot)
- Replace tube
5️⃣ Extruder gear not gripping properly
Symptoms:
- Filament being ground down
- Groove visible in filament
Causes: Too little grip pressure, gear dirty, spring tension wrong.
Solution:
- Clean gear
- Adjust grip pressure correctly
- Replace worn parts
6️⃣ Heat creep (heat rising too far up)
Symptom: Clicking after longer print time.
Why? Filament softens too early → jams in heatbreak.
Solution:
- Check hotend fan (must always run!)
- Clean heatsink
- Reduce retraction values
- Improve enclosure ventilation for PLA
🧪 Quick diagnosis
| Test | Meaning |
|---|---|
| Manual push-through difficult? | Nozzle partially blocked |
| Clicking only at high speed? | Flow too high |
| Filament ground down? | Extruder slipping |
| Problem only after 30–60 min? | Heat creep |
🎯 Quality tips against extruder problems
- ✔ Store filament dry
- ✔ Perform cold pull regularly
- ✔ Keep hotend fan clean
- ✔ Print temperature towers
- ✔ Calibrate E-steps
- ✔ Know max volumetric flow
🧠 Pro mechanics knowledge
An extruder has limited force. When backpressure is higher than motor force → steps are lost → clicking sound.
The problem is almost never "the motor", but always:
- Resistance in material flow
- Wrong temperature
- Or mechanical misadjustment