Are you sure it’s the hotend or the issues described above?
If it’s getting stuck half way down the AMS chamber like I’m experiencing, it’s pretty brutal.
It’s like the extruder wheel isn’t gripping the filament and pushing it down.
Somebody made a mod of the arm and I went and printed it and switched the wheel out, and still working for me.
This thing is junk. Prints amazing but my Kobra 2 is more reliable at this point.
Got mine last Friday and haven’t been able to use it since Monday.
Have you taken off the hot end to see if it has any filament stuck in it? I had this issue before without the stringing and I had to grab pliers and pull the filament out.
Having this same issue and the same error on my A1 Mini. I cleaned the hotend and nozzle so that’s fine. The printer is three days old (two of those days spent trying to fix it) and has four prints with Bambu’s PLA Basic. Actively working on trying to take the extruder apart and see if that is the issue. Do you think it would still be the sensor on the mini? I’m also not using an AMS. My filament just won’t feed through the extruder unless I take the PTFE tube out and manually shove it through. Even after manually pushing it through pressing the extrude button does nothing. And the gears just click and jump when trying to load the filament the way the machine wants to. Should I just buy a new sensor if there is no clog in the extruder?
I would try to look at the wiki for possible causes, and also contact support because they might be able to help you but at least get you a partial or full refund. It sounds like they’re is filament stuck somewhere in it, I have had the exact same problem, had to take it apart and take out the filament. I hope this helps and isn’t to late.
Hello all i am having this issue right. I have even replaced the extruder and still having an issue with my A1 Mini not extruding. I’ll try looking to see if there is a misalignment but would be interested in knowing how to replace the filament sensor. I suspect this may be the issue
there is no clog as i am able to manually push the filament through the nozzle .
Having the same issue.
Extruder clear & aligned, replaced filament sensor, replaced filament hub.
Still doesn’t work.
Gonna submit a ticket.
Well, after about 3 hours & I turned the printer back on & it’s working fine.
Don’t really know what the problem was or is, but it seems to be fixed…for now anyways.
I’m having the same issue
I think that lot of issues with extruder not extruding on A1 is caused partly by a bad design of extruder gears. There are other factors of course, but generally the ability to extrude is worse on A1 then on P1/X1 because of the extruder gears design.
A1 extruder gears:
The left wheel is smooth, it just applies pressure to the right gear which feeds the filament and has a design of a mill wheel instead of classic teeth on P1/X1.
P1/X1 extruder gears:
The difference is clear - two gears with teeth.
This doesn’t have to affect you if you print only regular PLA, but once you add some matte PLA to the mix or other slightly abbrasive material, you can have problems. Because of abrasives, filament hardness, melting point, etc.
This is the only reason I regret buying the A1 and I’m thinking about switch to P1.
Me too, same issue. I’ve only had it a month and not printed much. It’s become more frequent now. After getting to 15% on my multicoloured print from spool 1 (which kept failing on my last print I decided to eliminate the pla by putting another pla in) it keeps giving me the same message. Sometimes I get the unable to feed one too. I’m literally watching it extract the pla for ages then doesn’t even attempt to print or will print for about 2 seconds then go back again, then I get the message again. It’s so frustrating. I’ve had to cancel my multicoloured print now which I’m not happy about 15% into.
My A1 was stopping after 5 minutes printing every time, i would resume the print, it would work, and 5 minutes in or so, it would stop printing with the same filament stuck problem. I Cleaned the ams hub shaft, the one with the spring, which was all gooey, i dont know why, and cleaned the filament sensor too, used electronic contact cleaner spray. I cleaned everything removing only the ams hub, no screws. Seems to be working fine for now. Though it made a grinding noise at first, then it stopped, i guess i was too eager and didnt let the spray dry properly.
Do any of you guys also get this kinda goo in the ams hub shaft? (IDK the proper name for it, its the tip of the hub that goes into the extruder piece)
Ok, so after a while the problem began again, but this time i figured the problem out, i saw some other post (lost the link) where someone told to check the screws behind the hotend assembly, one of the screws was loose, causing the hotend and nozzle to be misaligned, its been a week and the problem seems to be gone
That sounds familiar 
I’m getting a similar issue but only when it changes colors of filament. This forum won’t let me create my own post yet, so I’m hoping someone in the know sees this one. I lost two prints now because of this. 
Same prblem here. Brand new printer about 6 prints in and suddenly getting this issue. If i push reaolved a few times it eventually starts printing then stops again. Will try disabling tangle detection
For some reason the bowden tubs do not lock into the hub…checked out the fix it video where you compress the silver thing in the hub with no luck…any ideas out there or should I just buy a new hub…frustrated that I can’t yse the new AMS Lite…my apologies if I posted this in the wrong place!
I landed here and this might help someone. I am unfamiliar with the names of all the parts so forgive me even if I have 5 A1s (The best 3D printer I have owned since the dawn of 3D printing especially for the price. It really is in the sweet spot of prices.) I was having the same error. I tested on different filaments. Same error after 5 minutes or so. I removed the AMS 4 port feed at the top with the two screws and unscrewed the sensor bar on the unit. I noticed a sticky grease type substance on quite a bit of the silicone and some of the sensor areas. It seems the metal curved bar inside touches the two bottom sensors to detect the filament thus I think it was possibly interfering either with contact or stopping contact with both sensors. I took a bit of dawn soap (what would we do without dawn soap) and water mix and gently cleaned the silicon unit of course with ZERO power supply to the unit. Then THROUGHLY dried it. I then took the plastic part 4 port feed that had quite a bit of it on the areas that would not need lubrication and cleaned those as to not have this happen again.(Be careful removing the cap piece locking the feed to the head unit I have broken one of those before.) I also took apart most of the head just to look while I had it on my work bench. I saw nothing out of place besides a small amount of filament of course on the feeder wheel. (Enough to auto clean during use.) I reassembled and carefully tightened all the screws back. I think the cleaning is what it needed as so far so good. While on the bench I re-lubed the inner rails and the posts rails carefully. This is on a unit purchased about a month ago. (It has been printing my Card Game Gliders for about that month pretty constantly so lots of use.) My other 4 are older and have been fabulous with 1/1000 the problems I have had in my years and years of 3D printing boy we are spoiled these days.
I hope this helps someone else!
ı have a problem with extrusion too
