I’m having the exact same problem with my X2D with an AMS pro 2. When using PETG it gives me a feeding error and I have to click continue to retry twice before it works.
Received an exchange device today and so far i have no problems with the AMS anymore.
A new Firmware also addresses AMS loading problems
New to all this. where are these 5 screws located?
Scroll up in this post for pics. They are located on the underside of the ams hub
I had this issue with both of my AMS2 units. Bambu sent me new internal hub units and I haven’t had a problem since
Sent new hub and no issues yet. I do think its absolutely comical that I spent $900 on a printer bundle and am forced to DIY fix it myself instead of being sent an entire new unit as a swap. Not that I can’t fix it myself but that’s a total joke. Bambu lab advertises as the just buy it and print/apple of 3d printers and they expect people to fix this ■■■■ themselves. I paid for a new, working product and 1 month in I am expected to unscrew and replace internal parts of it. I can absolutely see someone who’s very inexperienced (again, a typical user of this printer brand) breaking a wire/connector, or having trouble reassembling the unit. For me it was easy but shoot man not everyone should be expected.
Just went tru 466 post and it is a bit reassuring to realise I’m not the only one with this issue. It seems to me that the pressure on the filament in the AMS hub is way to high. My filament comes out looking like 1.75mm threaded rod. I do have a support ticket open and after sending them a some video’s, photo’s and logs they send out replacment parts. So no complaints about the service from Bambu on that front.
Ah, well, if they can get it fixed I’ll be a happy costumer again. But it did make me miss my A1 combo for a moment.
And this is what my filament looks like after a few rounds in the AMS:
Hi. I’m waiting on my replacement AMS hub. On your replacement unit, does the hub has any identifiable serial numbers/version that can tell it’s a update/newer unit? I’m wondering if Bambu Lab just grab one off the “shelf” and just mail it.
Trying to read through this thread with 2 H2C units, and 8 AMS 2Pro’s. My units have basically been inoperable for a good little while, I just didn’t realize it. I would try and switch to different AMS to get printing again. Since I work long hours and do remote printing the majority of the time, I have just shut the machines down over and over out of frustration.
Hi, I had similar issues with the AMS 2 Pro not feeding (faulting) and it appears to be something with the AMS hub. I printed this fix and I have yet to have problems. Maybe that might help?
It seems like there are two distinct problems. One is with the X2D on the toolhead side with the left nozzle and the other with the hub of the AMS.
I had the AMS problem and managed to sort it out by replacing the spring in the tensioner arm. It’s just way too strong. I get that Bambu is trying to make things “safe” and redundant but you can definitely be too tights.
I swapped in a 0.5x6x20mm spring and the 0700-8006 error hasn’t happened since. And the teeth marks on the filament are closer to what I’d expect. Still a little tight but manageable.
Top is my spring, bottom is the original AMS.
I did get a replacement hub and checked if it has any specific markings on the plastic and besides the little QR code I couldn’t make out much. The box did have SAA038-V1 written on it. I checked the spring and although it isn’t very scientific, they feel exactly the same. I’m not planning to swap it in at the moment.
As far as the X2D error this is weird. i’ve so far printed a riser and swapped out the left nozzle PTFE to a 3mm ID tube. It seems to have worked for the most part but yesterday I had it happen in the most annoying way.
I have some old ABS that I’m trying to use up and a spool had one coil row of coils left. I tried loading from slot 1, slot 3 and slot 4. Cut the tip of the spool flat, and at different angles and the same issue kept happening, the AMS loads it up to the tool head, stalls a bit there and then unloads and keeps doing it constantly I got “buffer signal is abnormal” but wasn’t patient enough to write the code down.
Put a different slightly more full spool in and it worked fine, no errors.
I’m struggling to tell whether it’s a real mechanical issue or a firmware misconfiguration to be honest and I’m leaning quite a bit towards the latter. The filament sensor in the toohead triggers, it just doesn’t grab it and trips out.
I moved to printer and AMS to another place after 300h printing and forgot to put the washer that presses the hub button again and, alleluia, I haven’t experience the slot 1 problem since.
It has been a week now without any fault (and I systematically use the slot 1 to test my luck).
I guess the hub spring has somehow mellowed ?!
I did end up recieving a replacement hub and buffer from Bambu. And I don’t think the buffer is part of the problem, it didn’t make a difference when i swapped that out at first. But still nice to have a spare one offcourse. But the AMS hub is a different story. When I changed that out most of the issues where solved. No more chewed up filament, no more grinding of gears. And a lot less feading issues… Still not perfect abviously but my main consern now is the tight bent in the PTFE tube at the extruder end. If I take the glass of the top and take the tube out of the chainguides it works flawless.
But I want to print with the glass lid on so I need to find a sollution for that, but at least my AMS is fixed. It really are two sepperate issues. The AMS (hub) was the problem with the filament being chewed up wich in turn made the resistence in the tubes higher off course.
The metal teeth in the PTFE couplings of the buffer (or anywhere else in the path) can break and once cleaned out still not show symptoms at first. I broke one of mine in the H2D buffer being a gorilla changing the tube and bought a replacement when it was back in stock, and a few weeks later changed it out. I even kept the old one just in case. Thats the only real failure I’ve had and it was self inflicted. Good call keeping that spare and probably was a good idea to send it just in case.
I was having the same filament feed error being discussed in this thread. I reached out to Bambu through a support ticket. I made some videos they asked for and provided the machine log. Bambu decided it was a malfunctioning left extruder filament sensor. I was skeptical but it did the trick. I haven’t had any errors yet after about 10hrs of printing. Fingers crossed!
Hi everyone,
I recently ran into a problem with my AMS 2 Pro while printing with Bambu PLA Silk Gold.
The print started normally, but after about 30 minutes the AMS reported a filament feeding error. The filament could no longer be pushed from the AMS to the printer.
I pulled the filament out manually and noticed that it was badly deformed and looked like it had been ground by the drive gears.
After that, even regular PLA filaments would not feed correctly anymore. I disassembled the AMS and found that one of the drive gears was packed with yellow filament residue. The material seems to have filled the gear teeth, preventing the gear from gripping the filament properly.
My questions:
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Has anyone experienced this with Bambu PLA Silk Gold or other silk filaments?
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What is the best way to clean this gear without damaging it?
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Should the gear be replaced, or is cleaning usually enough?
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Are there any AMS settings or recommendations for printing Bambu PLA Silk filaments?
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Do you reduce feeding speed, dry the filament, or take any other precautions?
Any advice would be greatly appreciated. I would like to get the AMS working properly again and continue using Bambu Silk filaments without this issue.
Thank you!
What I’ve been founding is that in the changing of filament there is an “Overfeed” that can blunt the end of your print. The fix for me has been to fully remove and re-spool the filament and then to clip the end. This gets it back to printing until it errors out. The full problem appears to be in the sensor / feeding mechanism. It slips and doesn’t really report it to the fact that it loses track of how much it needs to spool to the print head then gets in this loop of over-feeding it which blunts the fillament ends. Trying to force it by continually re-trying to print without resetting it causes trouble.
Update: I found the cause of the feeding issue
I disassembled my AMS 2 Pro and found that the problem was not in the filament itself, but in the internal hub assembly.
After opening the unit, I discovered that the drive gear inside the hub was completely packed with PLA Silk Gold residue. The filament material had filled the gear teeth, preventing the gear from gripping and feeding filament correctly.
As a result, not only the silk filament stopped feeding, but regular PLA also started failing with the same feeding error.
I contacted Bambu Lab support and provided photos of the clogged gear. They reviewed the case and have agreed to send me a replacement internal hub.
My advice to anyone experiencing AMS feeding errors:
Open and inspect the internal hub.
Check the drive gear teeth carefully.
If the teeth are packed with filament debris or residue, take clear photos.
Contact Bambu Lab support and include the photos in your ticket.
Hopefully this information helps others diagnose similar AMS 2 Pro feeding issues.
I am still interested in hearing from other users who print Bambu PLA Silk Gold. Have you experienced similar gear contamination, and are there any recommendations for printing silk filaments in the AMS 2 Pro?
Thanks!
It’s the same issue that a lot of people talk about in this thread - too much pressure on the filament in the hub. Please read above.
I’m having a similar issue.
Hi, having AMS 2 Pro issues (I think). Using an H2C. When I try to load a filament, it spools down to the toolhead, stops, than rewinds. It does this about 4 times then I get an extrusion error. It happens with each slot of the AMS. Additional points:
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Using PETG or PLA, filaments have gone through complete drying cycles in the AMS.
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Nozzles are clean as a whistle
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If I remove the PFTE from the print head and manually feed the filament, all is well, extrusion and subsequent printing are fine.
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if I apply pressure near the end of the PFTE tube (just before it would enter the toolhead), the filament pushes through, suggesting the AMS itself is fine, I think?
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the entire combo unit is new. The ends of the PFTE tubes seem clean with straight ends
Thanks in advance for any advice