¶ Issue Description
During the printing process, the extruder servo motor in the toolhead continuously monitors changes in extrusion force. If abnormal extrusion force is detected, an error will be triggered, and the print task will be paused. The user must resolve the issue before resuming printing.
Possible causes of this issue include:
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Filament jammed inside the toolhead
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Hotend clog
Extrusion related components:
¶ Troubleshooting
Before disassembling the toolhead, ensure the printer is powered off.
¶ Tools, Equipment and Materials
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H2.0 Allen key
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H1.5 Allen key
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Diagonal cutting pliers/scissors
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Needle-nose pliers
¶ Fault Isolation Process
Detailed steps are provided below.
¶ Solutions
Users may adjust the order of these solutions as needed.
¶ Step 1. Cool down the hotend and manually cut the filament
- Set the hotend temperature to 0°C and wait for it to cool down to room temperature.
- Press the cutter on the side with the extrusion issue to cut the filament.
¶ Step 2. Heat up the hotend and attempt to pull out the filament in reverse
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Set the hotend temperature to the filament’s printing temperature and wait for it to heat up.
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Disconnect the PTFE tube at the top of the extruder.
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Operate the extruder to rotate in reverse while manually pulling the filament.
¶ Step 3-1. If the filament is successfully pulled out in Step 2, the extruder is functioning normally
- Trim the bent or expanded front end of the filament.
- Set the hotend temperature to 100°C, remove the hotend, and use needle-nose pliers to remove residual filament from the hotend entrance while it is still warm (be cautious of high temperatures; wear gloves if necessary).
¶ Step 3-2. If the filament cannot be pulled out in Step 2, the extruder may be malfunctioning
- Disassemble the extruder front cover and hotend.
Refer to Steps 1–5 in the Wiki How to Disassemble and Assemble H2D Extruder to remove the quick change tool interface and hotend.
![img_20250113_154035[1]_cn.jpg](/h2/troubleshooting/hmscode/0300_0900_0002_0003/img_20250113_154035%5B1%5D_cn.jpg)
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Use needle-nose pliers to remove residual filament from the hotend while it is still warm (be cautious of high temperatures; wear gloves if necessary).
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Use scissors to trim any deformed filament inside the toolhead, disconnect the PTFE tube above the toolhead, and manually pull out the filament from the toolhead.
- Check if the filament is stuck at the front cover guide entrance or inside it. If so, clean it (refer to How to check which part is clogged in H2D)
¶ Step 4. Reassemble the hotend and quick change tool interface, then perform an extrusion test
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Refer to the Wiki How to Disassemble and Assemble H2D Extruder to reassemble the hotend and quick change tool interface.
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Manually set the hotend temperature to the printing temperature via the printer screen.
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Manually insert the filament until it is gripped by the extruder, then press the forward extrusion button on the screen to attempt extrusion.
¶ Step 5. If the extrusion test fails, troubleshoot a hotend clog (refer to Nozzle/Hotend Unclogging Procedure for H2D)
If the above solutions do not resolve the issue, submit a ticket and upload the printer’s log files.
¶ Tips: How to reduce the frequency of this error?
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Ensure good hotend cooling performance to prevent filament deformation and clogs inside the extruder. Open the front door and top cover during printing to improve hotend cooling.
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Avoid setting the print speed too high.
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After printing with hard and brittle filaments (e.g., PLA-CF), avoid immediately using TPU to prevent hotend clogs.
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Use high-quality filament.
For more information about how to clear H2D TPU clogging, please click here
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
If this guide does not solve your problem, please submit a technical ticket, will answer your questions and provide assistance.
If you have any suggestions or feedback on this Wiki, please leave a message in the comment area. Thank you for your support and attention!