whats the latest on this? I haven’t printed in a couple of months, now all of a sudden my printer has an update and the AMS 2 won’t feed to the AMS Hub. If I press to re-read the spool it feeds all the way to the print head, but if I click load, or try to print it tries to feed to the print head via the AMS Hub, but never makes it to the AMS Hub. It tries multiple times and retracts. I’m very close to throwing this thing out of the window.
I’m also seeing the same thing with a brand new AMS2 Pro. If I power cycle it, it magically fixes the feed issue so it’s gotta be something software related. I even noticed the feed issue would be on all 4 slots, not just a single slot.
This just happened to my newest AMS, the filament gets to the internal 4 into 1 in the AMS and stops. After taking it all apart and then putting it back together as it looked fine, it appears the individual filament feeders don’t always push hard enough for the 4 into 1 extruder to catch the filament and push it thru. The temporary fix was to physically push filament by hand in the individual feeder as it tries to load it. You will feel a hard stop but a hard push and the 4 into 1 motor will grab it and work normal. I haven’t tried with other filament but this issue happened with PLA-cf for me which feels harder. So the issue is either the power level of the individual feeders or the gear design/tension of the feeder in the 4 into 1 internal hub.
I’ve exactly the same problem, but with PLA Basic. My AMS 2 Pro worked well for about 400 hours, but stopped yesterday suddenly to feed the filament of each of the four rolls through the motor residing in the internal hub at the rear side of the ams. After dismounting the internal hub I’ve seen that the filament does seems to be unable to pass the feeding pulley. When I cut the filament’s end with a knife to an angled shift, I’m abel to push it through under the pulley. But now I’ve a serious problem to remount and the internal hub and to position it so the three screw holes do really fit onto their studs. So far I was unable to position the ends of the screws to make them hit the correct thread positions for tightening. The problem might be the two thin rubber lips under the internal hub, as they always fall off. Will try to fix them with some silicone or so now. After being able to mounzt thwe internal hub, I’ll check te proper function of the internal hub. Th be honest, I’ve some doubts whethter it will work now as expected. Concnerning the numerous post here describing exactlyx this problem I wonder what Bambu Lab means to this obvious flaw of this device.
Oh, everybody interested in this can find a detailed, very well made video showing dismount/mount of the internal hub on youtube: **AMS 2 pro internal hub fix by Arc Twelve Builds
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Any other ideas how to get rid of this nasty failure?
Also having feeder load issues with the AMS 2 pro
Also having same problem on brand new AMS2 pro
I have noticed if you press the button on the Hub unit while its trying to load filament it will load the filament
Ticket No: US260316029001
Also having the same problem.
Had the AMS2 pro for just under a week, and it worked fine. I received messages on the control panel at every startup that some “modules” were incompatible and given the option to update the firmware. No problems, I thought, I upgraded the firmware, and here we are. I’m having the same problem as the others here are experiencing.
Today I have moved the feeder unit in slot 1 (the one with the problem) to slot 4 and put slot 4 feeder unit into slot 1 and now all slots are working.
hopefully this fixed the problem,
Having the same issue for months. I stopped printing right before Christmas and everything was working fine. Started back up mid January and ran into the same issue of the filament not reaching the HUB. Someone had mentioned going back to the previous update and I did get 1 part to print, and the it was back to the same issue. So I’ve replaced and cleaned just about everything and still will not feed when printing. But it will feed to the extruder if it is not printing. Is Bambu even addressing this issue since it’s been going on for just about a year?
Things that have worked for me but seems to be a “temporary” solution is to cut the filament tips at an angle. I then reinsert the filament in the spool feeder ONLY. Then retry the print and it “should” feed into the HUB on its own.
This seems to happen to me mainly when I have the AMS at a slight angle. I imagine it is the bore at the start of the hub where the filament fails to feed or just bumps into.
My ams 2 pro on my H2S with about 700 hours started having this issue. All 4 spots. It’ll load until the filament reaches the ams internal hub and then stops. Manually pushing filament in results in the same. It just stops at the hub. Tubes are all good and pushing the button on the hub doesn’t help.
I have to wait till this print finishes to take it apart. Had to switch to the ams-ht for now.
Hello,
I just bought a X2D combo with AMS2 Pro, I’ve had it for 10 days or so, until today I didn’t have any feeding issue.
Today I loaded up an old ( but still factory sealed ) PLA spool onto the AMS and dried it for about 8 hours before printing with it.
The first 2 prints went well, but on the third onwards, when it started feeding the filament, it loads up fine the first ~30 cm before being blocked, retrying a few times to load, then throwing me an error.
Upon inspection of the filament, on each failure to load, there is an indent in the filament at the same distance from the inserted end of the filament ( due to the feeder mechanism trying so hard maybe ? )
If I manually load the filament ( with the indented part of it cut out ) while there is no print job on queue, it feeds with no issue at least up to the buffer at the back of the printer. so my ( I hope temporary ) fix is that after each print ends, I fully unload the filament, and when I want to start a new one, I prepare the file, start feeding the filament, while the AMS is loading it, I select that AMS slot and start the print. The machine seems to be smart enough not to roll back the filament to the internal AMS hub ( which seems to be the area from which the issue comes up ) if that filament is the one selected to print.
EDIT: While typing this post I restarted a print a few minutes after one finished, no feeding issue this time….
I’m having the same problem, as is many others. Mine messes up on the #1and #4 slots. It seems to get to the internal hub then hangs. Then I get a error message, this has become really annoying.
I know there are a lot of others with this problem. My AMS2Pro is on my A1, and using only Bambu filaments. (PLA Basic and Matte). I’ve also noticed the it often will not read what filament is on the AMS or the color. Has anyone else had this problem? I’m beginning to think I should’ve kept my AMS Lite on it and not upgraded.
I have my A1 and AMS 2 at the dealer where I bought it because the AMS was still under warranty. They told me this morning 4/27/2026 that Bambu is sending some kind of servo to replace. I hope this fixes my problem. I will come back here and let everyone know what I find out when it gets replaced.
There is definitely a major problem here.
I have the same issue, with an X2D and AMS 2 Pro only a few days ‘old’. It will not get through the hub unless a) I manually give the filament a shove, or b) depress the spring button on the hub. It’s an intermittent issue, but very prevalent with multi-colour prints across all spools.
I contacted Bambu and to be fair a very quick response - went through the chat function which quickly passed the issue onto tech support. Next morning I had an update which said
This is because there is a resistance in the hub area that is causing the filament to get stuck.
If this situation occurs after the machine is received, it is likely that the vibration during transportation caused the internal parts of the hub to shift position.
It is indeed somewhat difficult for you to adjust the misaligned parts by yourself, and it also doesn’t align with our after-sales service policy of striving for perfection. Therefore, I will provide you with a new internal hub unit. You just need to replace it.
So, good support so far, and we’ll see if the issue is resolved once the part arrives and is fitted. 
Update on this: received the replacement internal hub (quite quickly, despite - I think - coming from China). Fitted it (which has clear instructions on the Wiki, but still quite fiddly), and so far so good. No issues and spools load smoothly from all slots.
I do wish the replacement included screws, which can easily be mislaid, along with the 2 silicon dampers (which are a mite difficult to line up correctly); so be careful with these if you’re replacing the hub.
Same Issue here new P1s combo (AMS pro)straight out of the box but cant get the filament to load for love nor money, will rase a ticket tomorrow. (Shouldn’t happen with a brand new unit though)
I have noticed on the AMS2 Pro that if you let the filaments sit for more than a couple days without using them they develop a slight crimp at the ‘push’ point which causes the motor to turn on the filament but not pull it in.
This could be taken care of by having the motor only hold the filament with enough force to keep the roll from spinning back but not heavy enough to dent the filament.
I am constantly having to stand by the AMS when doing new prints on rolls that have been in the AMS for a few days. We shouldn’t have to remove the filament completely.
My AMS feeder would feed the filament to the print head and would pause. After a couple of minutes the filament would recoil back into the AMS feeder and want me to add filament from an Ext spool. Here was the fix. All the print files which came preloaded on the SD card on my PS1 always default to the Ext spool. I went to the Bambu Handy app and loaded only jobs from the app. Made the AMS feeder work perfectly. Apparently there is a way to print from the AMS with the files preloaded on the SD card. Haven’t got that far yet.