[P1S] Extruder Gear suddenly lost all grip. Cant feed filament

Bambu Lab P Series Troubleshooting
1

Hi everybody,

I have a really strange feeding error with one of my P1S.
The printer itself has just about 350 hours and is only used with PLA.

After finishing the last print (perfect quality - as always) I was not able to extrude filament anymore.
To minimize the possible error sources I load the filament per hand.

The following happens: Gear grips the filament, I push slightly until the display asks me to retry or load. Usually I give the filament a slight pull, just to be sure that it is inserted correctly. I can just pull the filament out, no grip at all.

What I already did:

  • Upgraded the extruder gear: I still had a unused hardened extruder gear at home → same problem
  • Changed the nozzle → same problem
  • Changed the filament sensor → same problem

I have changed every part which comes in contact with the filament, but nothing helped.
I inspected the extruder motor and tried to stop it with my hand (suggested in the wiki), the motor is strong - no way of stopping it.

I really do not know what else could be the source of this.
Does anybody has a suggestion? Thank you!

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With the front cover off of the toolhead can you see the large gear turning when you try to extrude? When you had the whole extruder off to change the gear did you try manually turning the large gear to pull filament through?

If you can see the large gear turning I would take the extruder back off, take the nozzle off and then try manually turning the gear and feeding filament through.

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With the front cover off of the toolhead can you see the large gear turning when you try to extrude?

  • Yes!

When you had the whole extruder off to change the gear did you try manually turning the large gear to pull filament through?

  • I have to turn the yellow gear to let filament through. When I hold the yellow gear I’m not able to pull the filament back out. So it seems that there might be an issue with the extruder motor or?!
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I found the cause of the error. I tried everything with two seperate filament spools from SUNLU.
It is highly unlikely but BOTH spools have filament with 1,4 - 1,5mm width. It was just a manufacturing error and the printer is competely fine…wow! :upside_down_face:

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