How tight should driving gear unit cover screws be?

Bambu Lab AMS Troubleshooting
1

I’m having an issue where my AMS is grinding my filament and not able to pull it through to the printer (P1S). Its the exact same issue and sound as this video: https://www.reddit.com/r/BambuLab/comments/19bd4n1/ams_grinding_my_filament_and_not_feeding_it/?rdt=57069

The issue is definitely only in the AMS because it prints fine using the spool hanger.

Other than the bit of stuck filament I initially opened the AMS to remove, there is no bits of filament anywhere in the AMS, barely any bits of filament in there tbh!

I’ve opened up the internal hub unit and haven’t needed to clean anything out of there but when I initially took off the cover the screws were tighter than I would have expected - should these screws be tight or normal hand tightened?

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The motor wheels move fine, no damage to them and I have been extra careful to make sure those annoyingly short cables do not touch the wheel when its back in the AMS.

Also the magnets inside the internal hub unit are all facing the correct way.

Just as I find a print I wanted to do for Christmas as well! :sob: :joy:

1 Like
2

I don’t know my Bambu Lab refuses to supply a torque spec for the fasteners, they definitely have them.

3

Well I’ve tried super tight, not very tight and ‘standard’ and I’m still not getting filament out of the AMS :frowning: time to debug some more!

4

I have the same issue. I notice the gear wheel spin free on the shaft, that make no sence because it cant push the filament. Does yours do the same? Like the plastic gear is glue to the shaft, but the steel gear is not and spin free.

5

I have a ticket for the same problem for all four ports. Support says my internal AMS hub is broken. A new one is in the postal service now. I expect the new part as soon as the holidays are over. I have the same behaviour as in the video posted here.

6

BTW, When I filed the ticket I explained that I had cleaned the AMS hub according to Bambu Wiki and that I was not able to find anything inside the hub. Then I made a good video of the problem and sent it with my ticket. A little slow response (due to the holidays?) but I got a solution in their first answer.

7

After changing the internal AMS hub my AMS is working great again.