It’s a bit puzzling to me, but with the new AMS 2 Pro for some reason the AMS will fail to feed the filament into the extruder on the first attempt which causes it to roll all the way back to the spool and try again. I confirmed the extruder sensor in Bambu Studio does detect the correct filament and color before retracting so I dont think it’s a sensor issue
I watch the filament leave the AMS unit so no issues there and pass through the AMS Hub just fine, but when it reaches the Extruder it enters the Extruder housing as if it were about to load before it retracts and it requires 2 tries for it to successfully load. This does not happen every single time, but just enough to where I’ve noticed it and it happens on any of the AMS slots 1-4. This has never happened on my original AMS unit
This is not the same as the infamous pullback issue, this is the opposite in that it fails to load into the Extruder properly on the first try…and ideas on what may be causing the issue?
Following as I have the same issue with my AMS 2 delivered with my H2D. The filament will pass correctly into the extruder, but then the AMS will retract it. All slots in the AMS are the same, and I get the same results to both the left and right nozzles. If I do the automatic AMS setup everything looks happy, but as soon as I try and print anything I get an extruder clogged error 0700-8007 090908. It’ll work fine if I take the AMS out and feed filament manually.
I’ve had a support ticket open for a week now and the only response I’ve had was last week when they asked me to check the nozzle for clogs (this was before I’d even printed anything).
I’ve been looking at this for the last two days. The best I can tell sometimes the AMS 2 pushes the filament all the way to the extruder but it stops pushing just millimeters shy of the extruder grabbing it. This is just a guess but I think if they adjusted how much farther the AMS pushes once the filament sensor in the print head is triggered by a hair it would fix the problem.
I’ve learned a lot in the last 24 hours. Another thing I figured out, DON’T swap the two ptfe tubes going in to the print head. The dark tube goes on the right, going to the top buffer. The white one on the left going to the bottom buffer. If you swap them you’re going to confuse the heck out of the printer and the sensors aren’t going to figure it out.
I guess my issue is a little different in that the AMS is working, but this issue occurs several times per hour when doing a multicolor print.
I managed to capture it on video so I can open a ticket along with the logs from the sd card, I plan on opening the ticket shortly and if I receive any update I will pass it along
I had an issue but it was because I was using a printed coupler for the PTFE tubes and the filament was catching on the coupler. It would try several times before throwing an error. Once I made sure the tube was properly seated in the coupler I haven’t had any problems.
You may want to check the whole path to insure the filament isn’t catching somewhere. Maybe manually run the filament through the same path and see if you can tell. The worse was some transparent PETG as it was stiff and because it was curved it could catch on anything.
Just wanted to update, I received a reply from customer support and they claim the issue is due to “excessive feed pressure” and suggested the two models below to help reduce resistance…one of the models is external and can be printed in PSA, but the other is directly above the extruder and is recommended to print in PETG due to the added heat resistance.
I will update this thread once again after I print these models and try them out
I have exactly the same issue with my new AMS 2. I connected it to my X1C in the exact manner and place of my old AMS. I’ve never had this issue with my old AMS, so clearly it’s a no issue introduced by the new AMS 2.
It indeed seems that it stops just too early with feeding. Should be a software fixable issue , if you ask me.
What’s confusing to me is that the extruder sensor detects the correct filament and color in Bambu Studio so logic would indicate that once it passes the sensor that the extruder motor would take over and start feeding it through.
You are correct though that this issue never occurred on my original AMS, I will add that I’m on 1.6 firmware (1.06.01.02) as when I upgraded to 1.7 I lost the ability to view the camera or record timelapses so I rolled back to 1.6.
Perhaps this issue has been addressed with the 1.7 firmware…do you mind if I ask what firmware version you are running?
Hi, I have the same issue here.
Never been able to feed a spool to the nozzle, even filament detection works 1 out of 10 times.
The automatic AMS setup fails as well.
I get the error “Filament Odometer has no signal” after having tried for about 2 minutes.
All AMS slots do the same
I’ve opened a ticket to bambu and waiting on their suggestions.
Will keep updated
My first expirience with the Pro was the initial push towards the Printer and the Hall sensor holder in the Filament Hub Unit broke instantly. Ticket and waiting…nice 1st Hour exp.^^
If either of you would like to reference my ticket to relate it to your own I included the ticket number below. I work in IT and so usually whenever an issue is reported by multiple users at once it tends to get their attention especially if you reference other tickets with the same issue.
If you’d like to include your ticket numbers as well I can relate it to mine so they’re all on the same page
Update on my issues: They seem to have gone…
I was going to make a video for support on the behavior, so I re-attached the AMS 2 Pro directly to the filament buffer of my X1C and started loading rolls. They all were recognized perfectly and could load them in the tool head without any issue.
What I did notice that I now hear a very distinct ‘clunk’ noise in the extruder head and the AMS 2, like they are both locking at the same time. I didn’t hear that with earlier tests.
I will keep using this AMS to see if the issue resurfaces. I hope it was a fluke and it will keep working as intended.
Maybe the rest with issues could uncouple and couple it again, maybe it helps for you too.
I will keep checking in here to report any issues.
Ah gotcha, so you just re-seated the PTFE tubes on the rear coupler that leads to the extruder? I tried that before and it didnt really help unfortunately
UPDATE: I printed the 2 models that Bambu customer support suggested in my earlier post and unfortunately that did not resolve my issue and the AMS is still retracting 2 or 3 times before successfully loading despite entering the Extruder housing with no issue.
I updated my ticket and I’m awaiting a response from customer support with more suggestions…this is extremely frustrating and my ultimate worry is that I will wear out the motors in the AMS due to how many times it has to retract and try again
With the P1s and AMS2 pro.
I’m using petg-CF
Only one color.
When the filament finishes in one AMS slot - the new slot doesn’t seem to purge enough.
When the new roll starts to print - there is a small gap in the print.
There is no prime tower as its all one color.
Only one filament so cant adjust the flushing volume either