Honestly this is awesome, unfortunately I neither have the skills nor the confidence nor any of the tools to desolder and re-solder the parts 
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My update.
As per my request Bambu support are going to replace my AMS 2 pro under warranty…just working through that process now.
I did ask the question if they have narrowed down the problem to a production batch of AMS’s or identified the actual cause. But alas no answer to my questions…
Strange thing is that after I pulled apart the AMS 2 all the way to Hub apart as well and put back together with no replacement parts it has been working perfectly but I’ve only done a handful of prints.
My concern going forward is even with another brand new unit the issue will return…seeing they don’t seem to know or want to admit what the problem is.
Cheers
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They sent me a new AMS 2 Hub which I installed today, and after numerous prints with numerous loads/unloads, it’s currently running fine. Hopefully it stays this way.
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Esa es la clave, he acercado los sensores y ya funciona mi AMS2. Gracias por la solución, espero que el Soporte de Bambulab encuentre la solución y mande esa plaquita que no debe costar mucho y se cambia fácil.
Got my replacement hub fitted and so far things have been fine running on my H2D. I think this proves that the issue is definitly down to the hall sensor for the hub motor, when replacing the hub the motor is used from the previous hub and is working fine so it must be the sensor that is at fault.
I image that Bambu are fully aware of the issue and we will see a redesign / replacement sensor being used in the near future. I just hope my new hub continues to function without issue, the first one only lasted for just over 400 hours of printing.
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Dang, mine only lasted for ~50 hours of printing…
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Not good. Get a ticket open refering to this thread.
Today I have had this reply:
Blockquote
On review of the nature of the issue, we believe the issue is related to the odometer within the AMS internal hub having a signal issue.
It may be the case that the issue can be resolved by resetting the connections between the AMS internal hub and the AMS main board. As such, we would initially ask if you could please refer to the following guide and implement the steps detailed: HMS_0700-0200-0002-0002: AMS A The odometer has no signal. The odometer connector may have poor contact. | Bambu Lab Wiki.
If, during this process, any damage is found, could you please provide images of this?
If no damage is found, but after the steps have been completed, we can proceed to arrange for a replacement internal Hub to be shipped to you.
Blockquote
Of which i think is the cause for 99% of issues in this thread.
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The parts they sent me basically gut the entire AMS 2 Pro unit and rebuild it from scratch. I ended up breaking one of the teeny tiny headers on the motherboard that was being stubborn accepting the connector so now I’m stuck. To be honest I’ve never seen a company expect an end user to do such complex and delicate rebuilds of electronics, for this very reason. I’ve requested they just send me a new in box unit which is what they should have done in the first place.
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I just did this, it worked, it feeds normally!
For one print… And now it’s back to not working
(Already have a ticket in)
New firmware update for P1S should fix the problems with the AMS 2 Pro. Did first tests and it always loaded filament without problems… seems to be a software/firmware bug.
Will do some more tests
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I stripped my AMS2 down twice and removed and remade the hub connections to the main board. On both occasions the first feed out of it worked fine but then it stopped working again.
I am several prints in after completley replacing the hub and it is working as it should do.
Rog, Is that using the replacement hub from bambu?
I’m wondering if they are sending out amended boards to those experiencing issues.
It was the same here… I disassembeled the AMS 4 or 5 times, also the AMS internal hub… did everything Bambu Support told me. Checked all connections in the board…
Everything worked fine until the end of April update, because of that I was always sure, that it is software related. Last status was, that the AMS2 was not able to get the filament to the extruder.
Now after the todays update, the P1S and AMS2 loaded filament around 20 times without a problem… and it was the only change I did since I left the AMS as a expensive storage box
Yes it was a replacement from Bambu. I did carefully compare it to the old one when I took it out and couldn’t see any difference with the sensor board but it looks exactly the same.
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Me acaba de llegar la pieza que me envía el soporte de Bambu, parece que se han dado por enterados de cual es el fallo, yo ya habia juntado y resoldado los sensores como dijo el compañero Ares0559. parece que vienen igual de separados, para mi gusto deberian estar mas juntos. o sea que no han rediseñado la pieza.
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Support have really annoyed me now. I reported the issue on my P1S with AMS 2 Pro within a few days of recieving it. They took on average 4-5 days for each response which i replied to almost immediately. I demanded an exchange/replacement ams several times.
Now, 40 days later (support ticket raised 12th April!) i asked again and get this response:
“Since your AMS 2 Pro is past the exchange period, it does not meet our exchange policy. We are sorry, but we cannot exchange it for you”
REALLY!?
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The AMS 2 Pro wont even load filament correctly, you can see it just grinds up the PLA, looks like the rollers aren’t unlocked and a few times it pulls the spool up out of its seat!
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Came here to report that I’m having the exact same issues that folks have shared above. Sadly, this only began in the past couple of weeks and the first few weeks of owning the AMS v2, it was fine. Now, I’m completely stuck with none of the 4 slots properly feeding into the extruder and every slot is grinding/chewing away at filament.
My ticket is US250522514001
Same issue here, I contacted them and no reply so far.
Did you find a solution?
Ticket No: US250521632001