3 of the slots work fine, but slot 3 of the AMS does not rotate the spool. If I turn the spool by hand you can feel and hear the resistance. Do I need to dissemble and work the inside over? Is there an easier solution? I am about to tackle the tear down. Have already done it once when I figured out there was broken filament in the ptf tubes under the tray. Any help or ideas appreciated.
This may help… AMS setup and Filament Loading | Bambu Lab Wiki
Look for the word “stuck” in the page.
Yes there is an easy way. You dont have to tear down anything. I had the problem that one of my filaments had quality problems at the top and along the first 30 cm of the filament. But I was not abel to pull it out.
What I did:
- Turn off the printer
- Turn it on and wait for the init
- When you turn it on after off, select a different filament champber or color
- After a while you will be able to pull out the corrupt filament
Cut about 20 - 30 cm of the filament which caused the AMS to get jammed. Re-insert the filament again and you should be good to go.
Do not tear apart the AMS. I have seen some users doing that, because they where not aware that you can turn off and on the printer to pull out the filament. It does not work directly. You need to switch to another filament first and sometimes wait a little until the jammed filament gets released, but I was able to pull it out this way at least 2 or 3 times in the last 3 weeks.
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Didn’t know this one, great tip! 
This continues to make me think it’s the filament angle going into the feeder causing problems on a lot of the errors.
Filament angle out of the tool head also seems to cause the issue sometimes too.
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Not only that. In my case the top of the filament was half broken or not fully smooth. Or some areas of the first 20 cm are messed up.
Lots of good advice, thanks. The problem does not seem to be the filament. If I place an empty bambu spool in slot 3 it will not turn. If I load a filament into the feeder and the AMS grabs it as it should but once it gets tight, the spool will not turn and the AMS finally faults and the light goes red for that slot.
I am becoming convinced that either there is something jammed in the system preventing it from turning smoothly or something is out of place keeping to from turning smoothly.
Can you see the gears turning inside the 1. stage feeder?
There were reports that for a few units the greezing oil did creep on the shaft holding gears and the gears would then simply slip on the shaft instead of turning.
And if you remove the spool, but still feed the filament into the slot, does the rubber coated shaft where the spool rests on turn?
Same problem happens to me with the 250 gr PLA-CF demo spool on slot 3. The funny thing is that there is no stuck at all inside the AMS. If I disconnect the PTFE tubes on the back of the printer I can simply remove the filament and pull it out completely just removing the spool and pressing the unload button. I dismounted the AMS and could not found any broken filament. It really seems a problem related to the filament angle going into the feeder when the spool is almost empty. The force applied to the filament is so strong that the sppol is lifted out of the slot while the rubber coated shaft remains blocked. Any other tip?