I have the same problem. filament makes it into the toolhead, does a little tiny push like always and then retracts. Manually loading works fine. It started after a cogged extruder. (Accidently closed the door doing pla and got heat creep). I have tried everything. No success. I am starting to think it may be the sensor on the feed that detects the cutter arm and low filament. I ordered new ones but am at my witts end. Nothing it stuck, nothing is jammed. On fresh boot, the feed and unfeed buttons work but once you get the error loading the ams (any slot) it locks out the feed and retract buttons. It gives no error except for ācanāt loadā I sure wouldnt mind a solution to this.
Sometimes the spring on Buffer at the rear gets dislodged and the slide canāt fully extend. The spring flicks back into place easily.
I have been dealing with this issue for 6 months, since receiving the new printer and AMS. Bambu literally sent me every board to replace and finally a new AMS because no solution worked. A friend brought in their ams and tried it and got it theirs to work fine but this second AMS isnāt working either. It feeds in past the buffer about halfway and retracts in same spot every time. Iām at a loss. I donāt know what else to try. Tried all the suggestions above and still not working. At this point, I guess it will have to be a single color printer and weāll never get to use what we bought it for.
Letās think.
So your friends works where 2 you have donāt. Whatās different? Did you set his up any differently than yours?
Iām trying to look at this logically, so if I it seems like Iām talking down to you, I am not. Just how I think and type.
I had an AMS problem last night that I looked at 2 times and missed the problem.
Check the PTFE tubes for wear again (Iām sorry I didnāt read this whole thread). Iād really like to know what was different exactly from your friends AMS set up to your printer. I think thatās where the problem lies.
His looked identical and all he did is connect my two cords from my machine and put in my ptfe tubes and it worked. Iāve tried changing out the tubes, trying different filaments, on the first AMS changed out all the boards, the printer itself on one color prints fine. One of the tubes was a bit bent in the middle so I changed that out but same issue. Feeds into certain spot past the hub and then retracts. Doesnāt matter what slot I put it in either.
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It goes past the buffer to where? I mean I think I know where it goes but I put my foot in my mouth way too often. Where is the same spot?
Iām trying to think.
Thereās only one cord into the AMS. 6 pin in. Doesnāt matter which slot.
Correct about the cords. I just meant the one coming from machine to buffer, then buffer to ams. Here is a video of what has been happening since day one.
I guess Iām not able to show the video.
Can you be more specific on where that spot is at?
Are you able to visually observe the buffer spring during the filament feeding process.
If yes then see if the spring mechanism gets compressed prior to the filament reaching the extruder.
If not then hold the PTFE tubing that goes between the extruder and the buffer with your fingers right at the buffer with light pressure towards the buffer and see if the tubing moves out of the buffer before the filament reaches the extruder.
Check the small junction connection with the blue/black ends to see if itās seated and in the right orientation?
Thank you GenericUser
AMS keep loading and unloading - #48 by GenericUser
Day 1 of my AMS and my P1P. Wow. This will be great!
What?
AMS feed overheatingā¦
Spool stuckā¦
Unloading and reloadingā¦
What is going on?
There is no stuck spool.
After several hours to no avail I found this tread and read about the spring in the filament buffer. Could it be that simple.
It was. The spring had jumped out of its track. It became obvious that when you insert the tube you need to be careful you do not push the spring out of its track, Using a tweezers it was easy to get the spring back in its track, This seems to be a weak spot in the feeding mechanism. The spring can easiuly be pushed out of its track.
So, will this fix the problem. AMS now working with no issue. Two models printed fine, total of about 4 hours. I will certainly first look at the spring should any such error occur.
Not saying that the spring is the solution to the other issues presented, it certainly fixed my problem. Thanks again GenericUser.
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Just want to help you out here, those are PTFE tubes. Calling them cords can lead to confusion.
I just had this issue a couple months into owning my printer. Iām like 13 hours into a multi color print and it just started this issue. I read through the replies and I cannot seem to find an issue that matches mine. It makes it all the way to the print head and still goes back. I tried to trick it by taking the end of the tube off the print head and jammed some spare filament inside, nothing. It just keeps looping over and over. Any ideas? Maybe a sensor in the carriage is dead?
FYI just had this happen to me, first time in almost a year of ownership. AMS stopped with 18 minutes left in a 2.5 hour print, went into a load and unload cycle. After trimming small amounts off, I pulled the spool out after a retract and cut about 3 feet/1 meter or so from the spool, put it back in and it started printing again. If I had to guess, a small defect in the filament in that segment triggered a sensor when it encountered slightly too much resistance when trying to feed. Hope this helps somebody else and thanks to Halloween for your tip.
Note: this is a generic filament brand I purchased off Amazon, not a Bambu Labs filament, but even with a name brand/higher-quality filament small imperfections are bound to happen.
Iām having this issue with the AMS where the filament keeps getting stuck inside the hub, and I would have to open it up to clear it every time. Is there anything I can do to stop it from getting stuck?
I have all my AMS options turned off.
When I insert a new filament, it loads all the way to the hotend, then pulls it all the way back to the roll, then goes back and forth endlessly. No errors. It will do this until I start a print, and then it works absolutely perfect with no problems switching at all. It leads me to believe its a firmware issue.