I have ran into my first AMS issue. I am trying to load a spool of Bambu Lab PLA Matte and when I put it in the first stage feeder it pulls in about 7 inches or so and stops. The gears just spin back and forth but the gears do not engage. I get a single red flash and then the light changes to white and I do not get an error.
I originally thought I had a piece of broken filament, so I took the AMS apart and checked the PTFE tubes. No filament and everything looks good. When I look at the first stage feeder on the other 3 slots, the right-most gears are horizontal like here:
However, on my problem feeder, the right most gears are vertical and they do not appear to move up and down as they do in the others. Here is a pic of the bad feeder gears.
As additional info, I can click the Load Filament button in Bambu Studio it will feed in and function normally except it will not read the RFID tag. I can also unload the filament by clicking the Unload filament button and it will roll back up. And the gears in question looks like the other slots. However, if I change filament or refresh the slot so it will recognize what filament is there, the gears just spins and will not load filament properly.
None of the wiki articles appears to address my issue. Any suggestions?
Scott
I have exactly the same problem on slot 4.
I did not find any solution in the wiki articles either.
Grtz,
Webwil
Mine ended up being the filament hub motor assembly where all 4 feeders go into it. Bambu sent me that and a new mainboard and I just replaced the filament hub motor and worked perfectly!
Thanks for the reply.
I would think that if the problem is only with one slot out of the four it would more likely be a problem with the slot first stage feeder and not with the filament hub motor, but I could be wrong off course 
.
This will need a bit of further investigation on my side.
Grtz,
Webwil
After some investigation I found out that, although all spools are unloaded, the AMS thinks that this is not the case. (or so it seems)
I could solve the problem by loading and unloading a spool where the lever is in the horizontal position.
To find out what spool you need to load and unload I observed which spool tries to load if you push the flesh above the spool that you want to read the RFID (the one with the vertical lever).
For instance, my spool 4 doesn’t refresh when I push the flesh, but spool 3 tried to load (at least it turns). after spool 4 stops, I load and unload spool 3. At that moment the lever from goes from vertical to horizontal. When spool 3 was unloaded, I did the automatic detection on spool 4 again and it worked without any problem (as the lever is horizontal again.
I must admit that I have no clue why the lever stays vertical sometimes and thus, the automatic detection does not work.
I hope one can understand my difficult explanation dor something simple .
Grtz,
Webwil.
That is what I thought and Bambu thought at first too. They sent me a new 1st stage feeder and no dice. They then had me disassemble the hub motor and check the magnets and make sure they were lined up correctly. They were. Next step they sent me a new hub filament motor assembly and new main board. SInce I was lazy and didn’t want to unhook and hook up all the wires for the new main board, I just replaced the hub motor. Voila. Worked like a champ.
It had to be something in the electronics. The tech said something was causing it to think that there was filament on that slot and that is why it was not loading/unloading.
Thanks for your answer and explaining your contact with Bambu.
Did you contact them by mail or did you submit a ticket right away?
I will follow the same route. That way Bambu can solve the problem quicker 
.
Grtz, Webwil
I created a ticket. Once they told me they were going to replace the mainboard and motor it took a while. Got a little worried and replied to the ticket and the guy apologized and said they were out of stock on the mainboard and should be getting some that week. I received it like 3 days later. The good thing is that every response by Bambu was from the same guy so he understood the issue instead of passing around to others and having them respond.
Created a ticket.
As I had no photo from the problem I used yours from your opening post.
Hope you don’t mind.
I even explained it seems to be the same problem you had.
That way it can be noted by Bambu as a recuring problem.
Maybe we are not the only ones with this problem.
Thanks for your answers and help.
Grtz,
Webwil
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