Hi all,
i in the meantime already got an AMS HT replacement and still am having the very same problem again of the AMS HT not being able to load filament.
My 1st gen AMS, with the exact same printer config and the exact same spool of filament can load and print normally. So, technically it should work with the AMS HT as well.
AMS and AMS-HT and external spool holder go through the simple 4-1 splitter into the X1c and then to the extruder.
If i load filament from AMS HT it starts this cycle normally and pushes the filament to the extruder. Right at the extruder it tries multiple times to push the filament into the gears but it does not succeed and then terminates with an error that the extruder seems clogged or there might be too much resistance in the feed line.
What i did so far:
swap 1st AMS HT with a replacement after feedline, extruder, AMS HT hall sensors showed no obvious issues
shorten the PTFE as much as possible with no sharp/tight bendings / curves
remove all possible PTFE interruptions and replace it by 1 single, continous line to directly connect AMS HT to the X1c
check that the extruder is free and not blocked / clogged
check extruder gears spinning
check the PTFE push fit on extruder side
I am out of ideas, and so far Bambu support also could not solve it either. Maybe someone over here has a good hint. Would be great after weeks now, to finally be able to use it…
I wonder if the resistance check is just too sensitive? I’ve managed to get it to load consistently with the 1x AMS buffer but not the 4x AMS hub.
Exactly same problem and troubleshooting steps as you for sure — fresh PTFE all around, disassembled extruder completely, etc. Only thing that worked as swapping back to the buffer — going to the buffer to the hub again, no dice.
my Problem is i don’t us Buffer or Hub. I have the AMS HT only via 4-1 Splitter and even without that it fails.
1 single PTFE without any interruption also fails
It could be too sensitive or AMS HT and Extruder are not well in sync maybe
Are you sure the buffer, at least, isn’t required for the X1? Loading directly without the buffer isn’t mentioned in the wiki but it’s a bit sparse. I don’t have enough rep on the forum so I can’t post any links directly to it, sorry!
I don’t have the 4x simple splitter but I can try without the buffer and see if it does the same thing!
so, if i try to feed this way: AMS HT - Buffer - Extruder
then the AMS HT sends filament to the buffer and stops there, retracting it. Then it tries it several times again, but fails. I don’t even manage to get past/through the buffer at all. It quits the loading task with report of blockage.
I am quite sure now that the problem is the AMS HT. Maybe the filament blockage sensing part of it or its motor being too weak…sth. like that.
I haven’t been able to try bufferless but FWIW support are shipping me out a new hub to try as the logs show something weird going on there. Maybe you can try engaging with them again? It stopping short of the buffer though does feel like something is weak on the AMS HT side!
So far i was super happy with all my Bambu journey, but the AMS HT is a big fat disappointment.
Today i tried again.
4-1 PTFE splitter - loading failed with “stuck/blockage error”
buffer - loading failed with “stuck/blockage error”, but filament was not retracted
i tried pulling it back by hand, it was stuck…meaning inside the extruder gears for the first time.
I could extrude manually, but the printer screen once said “AMS HT motor slippage”.
Then i tried unloading, printer did nothing. Filament change, also nothing. After a minute or 2 it started processing those unloading commands. I abborted them as i expected it to be few in a row, which it then was.
I thought once the filament is inside the extruder, lets try to print. I got a small print done, first one! WOW! After finishing it retracted the filament. I was motivated for a 2nd small print. It failed and not even got anywhere close to the buffer. Mid-PTFE tube some centimeters before the buffer the AMS HT reported blockage/stuck filament.
…1 step forward, 3 steps back. This device has serious issues, for real.
Tickets updated, Logs and a video sent…lets see…
edit/ i just saw that the filament inlet inside the AMS HT shows A TON of debris. My normal AMS never even was anywhere close in its whole lifetime until now, to such an amount of filament debris.
Maybe the motor inside the AMS HT is not grabbing the filament properly, but rather slipping (always).
I have four AMS HT units, which I specifically purchased to ensure my TPU stays dry during printing. Unfortunately, none of them allows the spool to turn smoothly, making it impossible to use TPU effectively.
I have tried everything I can think of: straight PTFE paths, direct feeding to the printer, even setups with no PTFE tube between the AMS HT and the printer — nothing has worked. Of course, I am using the bypass port on the AMS HT for TPU.
I wish i’d was at the stage of TPU. I have some here and would also use the AMS HT for that. Right now i have a AMS light spool holder attached as external spool holder on the X1c which works quite well with TPU, but the filament degrades espacially over long prints due to humidity.
For my initial problem i was advised to try to use PLA to test. I have no fresh spool at hand, so i just went with PETG.
From previous attempts there was a ton of debris at the filament inlet inside the AMS HT, so i gave it a good vacuum to clean it up as good as possible without disassembling it.
Then…Through the bufferwith this PETG, it worked and printed a test cube. Yey! unload, reload, worked.
Through 4-1 splitter, it failed.Okay, i guess i need a Hub then…
(however the 4-1 was an advertised part during buy of the AMS HT which made me think it would work)
Pumped on PETG working, i dared to switch back to ASA. It worked. Load, unload went through the buffer to the hotend. Test cube, printed nicely.
Exactly nothing changed in regards to the config compared to all the attempts before. I have absolute 0 clue why it now worked a few times in a row, whereas it constantly failed all the times before.
Logs sent to support, i am curious to see what they are going to find or say…
I am having similar issues. I don’t typically use the AMS HT for printing, but the reason I got it, besides high temp drying, was to print abrasives like PLA Glow due to its upgraded inlet. I just had a 4 out of 6 hour multicolor print fail on me because the first color switch failed and continued to fail. I tried just about everything, but it just kept loading so close to the extruder, and then the motor in the AMS would seem to give out and even give out a squeal maybe a centimeter from the extruder gear. I tried bypassing the hub, I tried shortening the tube, I tried cutting off the filament it was using (because the gear in the AMS was actually chewing away at the filament where it would get stuck), and I tried switching hub ports. Nothing. I reluctantly had to stop the print. I moved the spool to my normal AMS, and it loaded and is now reprinting without a problem, as expected.
This has to be some sort of issue with either the AMS HT or the AMS Hub or a mix of the two. Hopefully Bambu finds that it is a software bug and this can all be repaired digitally but as of right now I almost feel like my AMS HT is not what I ordered nor what I expected from Bambu.
I have the same issue.
I have the 4 in 1 hub and the AMS HT seems to lid fine the filament up to the extruder, then a click is heard from the AMS HT (like a micro switch).
This repeat for 6-7 times than an error is displayed.
Any clou?
I checked but the printer path is perfect, If I use the AMS standard everything works fine. Only when I select the HT it fails to load the filament. Any other suggestion?
