I feel the same! Bought this because it’s ’plug and okay’ ability. Proving not to be.
I had mine on the right and they told me to put it back on top. Regardless of location the issue is still present.
Anyone else not able to remove the PTFE tube from the back of the AMS 2 (combo unit) or the buffer? They will not budge at all. I have a second AMS and a track switch that have not been installed and now I’m stuck. What do I do?
I had the same problem removing my PTFE tubes. I downloaded this model from Maker World…
“PTFE Tube Removal Tool for P2s, H2d, H2s by OfficineCasperLAB”
It was a quick print and worked great. Good Luck
Did you get this sorted? I had this on slots 1 and 4 (2 and 3 are not loading at all 
)
In my case the cable coming out of the buffer on the back and into the Extruder was not seated correctly, I gave it a firm push whilst the filament was trying to load and it’s now printing from slots 1 and 4.
Not sure what I’m going to do about slots 2 and 3, I’ve already replaced a hub, and a hub motor. That’s got slot 1 working again, but 2 and 3 are still just spinning and not taking the filament past the hub. I’ve been sent a replacement main board as well, but I’m not sure that’s going to resolve this as it seems like it’s a motor issue, or something specific to those 2 slots. Hopefully Bambu will just replace it, feel like I’ve done enough repairs myself on a unit that was only a month old when it failed.
Still having the same issue. I will say that customer support has been responsive. They sent me a new extruder, I went to my local 3d store and they installed it. No luck. The folks at the store thought it might be the buffer, so they replaced that (under warranty so no parts charge). It worked in the store, then I brought it home and the problem returned. I thought maybe it was the PFTE tube, so I swapped out the one leaving the AMS and it worked briefly before the problem returned. Then I thought maybe it was the position of the AMS (set on top), so I literally held it so the PFTE had a straight no curve path from the AMS into the top inlet. Well, like everything else, that worked once, but not again. So I am still manually pushing the filament into the brand new extruder while I try to think of something else. The 3d shop is great, I may pay to have them make a house call.
Thank you for the question and the update. I am having the same initial problem with BambuLab Gold Silk. It worked fine for a while but then it stopped extruding filament and gave me the Extruder Overload error. I followed the troubleshooting guides and Cleaned the nozzle, without nozzle the extruder purged some filament but then it got stringy and stopped coming out.
I tried to set the temperature to 237 degrees for my white PLA filament as the guide said to hopefully get it to extrude, but the temp kept going back to zero, both from the screen and the Bambu handy app.
So, in my printer toolbox I tried to perform a cold pull maintenance, but it errored out saying it could not retract the filament. I just sent in a service ticket. It’s beyond frustrating because my system is only a week old, and seemed to be working fine before the Gold Silk.
I’m glad you were able to solve your issue. I think mine has to do more with an extruder problem. The next troubleshooting step for me would be to follow the Extruder Clog Cleaning Guide. But I don’t really want to take the Extruder apart, and I shouldn’t have to with a new machine. So hopefully the Service Department will get back to me soon.
Best regards
Thank you so much to everyone involved in this thread.
I was having this same problem of lane 1 and 4 getting stuck often. I made the recommended fix of adding kapton tape on the marked spots, and no issues anymore. 
Update on my situation: It turns out there was an issue with both my AMS2 Pro and Data Transmission for my P2S. Since my unit is only a couple days old, Bambu Lab’s Customer Support has been amazing, and they are sending a replacement unit.
Fingers crossed that the new combo won’t have any issues.
All, I’ve been reading this thread hoping to find a solution to a related issue I’m having with the AMS 2 Pro + H2C. So far BL support has sent me replacements for the internal hub unit and motor, mainboard, slot A3 feeder, and all mainboard cable connectors. Nothing has helped.
My issue:
As previously established here, temperature can impact the magnetic odometer. After drying FULL or nearly full spools of BL PETG-HF at 65c the same spools will not load on slots A2 or A3 until the internal temp has fallen back to 30c. Edit: half full spools load without issue. I’ve been able to replicate on several full spools/colors of PETG and PLA.
There is no error displayed. The AMS begins loading and filament type/color is displayed on H2C screen but during the final “filament loading pullback retraction” the AMS always winds too much. At higher AMS internal temps (cooled from 65c to 48-50c) the AMS completely pulls filament out of the feeder. At lower temps (35-40) only about 1cm of filament remains in feeder and the AMS no longer thinks it’s present. (Filament type/color disappear from printer screen)
In addition to all the replacement parts BL has sent, I’ve also replaced PTFE tubes.
My issue doesn’t seem related to resistance, but rather odometer readings when the unit is warm. This leads me to wonder if all AMS 2 Pro’s behave this way.
Thoughts?
Same fault/issue here with a brand-new P1S and AMS 2Pro. AMS worked once for a tiny print, but now it’s constant HMS_0700_4000_0002_0001 errors. So very frustrating. AMS disconnected and back to printing via Cerial box. Ticket No: US260801716004
Just bought a brand new one for the sale they have going on. First one I bought was doing this and no idea how to fix it. Returned it 2 days later and got another one. EXACT SAME ISSUE!
So far, 4 days with no replies on my service ticket. AMS was purchased last week. I strongly recommend against purchasing an AMS 2 Pro; get a different brand! 
Same to me, got a new X2D and AMS 2 pro.
Keep complaining about: “The AMS assist motor s overloaded“. And I need to manualy resume about every 2 hours.
Never have this problem with my A1 mini.
Olá todo mundo, eu consegui resolver no meu caso, eu desmontei o hub para limpeza, o que conecta os 4 tubos, e na hora de montar o conector Encoder estava com uma perna torta, isso impossibilitou a maquina de reconhecer o comprimento do filamento enviado pelo motor do AMS 2 pro. Eu identifiquei o dente e com uma agulha eu reposicionei-o e reconectei o cabo. Como na foto. Funcionou! O problema de alimentação para fora do AMS, deve se resumir no funcionamento desse encoder magnético, muitos videos que vi na internet mensionam esse HUB.