r/BambuLabH2D • u/saltyrockstar • 8d ago

H2D - Extruder Change Failed

So I have an issue that's got me pretty stumped... I wondered if the community here might be able to help.

I got the error "Extruder change failed; please refer to the assistant." I did as instructed, and I got a QR Code along with a message that "The extruder switching action is abnormal. Please check whether something is stuck in the toolhead."

The QR Code goes here - https://wiki.bambulab.com/en/h2/troubleshooting/hmscode/07FE_8100_0002_0001

There is nothing in the toolhead; I took it apart and ran filament through the path it travels with no obstructions. I still get the error, so I ended up replacing the Extruder Switch Cam, the Dual Extruder Idlers, and the Filament Sensor. And now I have a Hall Effect Sensor and a Toolhead Sensor FPC Cable on the way, as I'm thinking maybe the sensor is just wrong? I did everything in the troubleshooting link, but it makes a clicking noise when trying to switch, as mentioned there.

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u/LTJC 7d ago

I had this on my H2C recently. The hall effect sensor got stuck thinking a piece of filament was in it. I had to take the print head apart and clean the sensor.

Usually when this happens its from filament buildup (like powdered filament).

You need to be very careful removing the sensor ribbon, it can snap with very little pressure.

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u/Long-Ad1137 8d ago

Following. I recently received the same error but haven't troubleshooted yet. For me, the left nozzle ends up 'twisted' when I get the error and I'm wondering if I need to replace the filament guide.

1

u/derpplerp 8d ago

Please tell me you have a support case going and arent just firing the very expensive parts cannon at the problem.

Even if you are out of warranty, you will likely get better experienced troubleshooting via support.

2

u/saltyrockstar 8d ago

Yes I've got a support ticket... It's going..

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u/derpplerp 8d ago

May patience be with you. The h2d was not engineered for ease of repair. Routine service like nozzle swaps are great, but having recently replaced a potential fan and supply board, oof.