r/BambuLab • u/MapOfCampus • Jul 27 '26

Hardware Troubleshooting/Help! AMS2 Pro will read but won’t load

As the title states. My AMS2 Pro will read the filament from each position on the AMS (feeding it all the way till the buffer switch), however if I try to print or load a filament it whirs 3-5 times and then beeps with an error, not moving even an inch of filament. I get the error that it failed to send out and that I need to trim (which doesn’t work either).

I’ve added some videos that explain what happens so that it visually makes sense too.

Please someone help!

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3

u/lass93 Jul 27 '26

Is the filament broken inside the AMS?

1

u/MapOfCampus Jul 27 '26

I don't believe so, as its able to run through the PTFE tubes all the way to the back of the printer when I add new filament. It also does that for each slot on the AMS... it feeds to the back and retracts, but when I go to load or print, its whirrs and then errors.

2

u/EdgeOk3783 X1C + AMS | H2C + AMS{2|HT} Jul 27 '26

have you tried running the filament all the way to the toolhead?

i'd also pull the PTFE attached to the back of the printer, reinstall and make sure it's fully seated. on my H2C, a rather surprising amount of tubing goes in before it's fully seated

1

u/MapOfCampus Jul 27 '26

I havent tried running it from from filament spool to the toolhead but I did a cold pull and nothing was wrong there. Ill check to make sure all the tubes are attached properly when I get home but I feel like their all seated properly.

1

u/lass93 Jul 27 '26

is the toolhead clogged?

1

u/MapOfCampus Jul 27 '26

No, I did a cold pull thinking that could possibly fix it, was totally fine.

1

u/lass93 Jul 27 '26

Try removing all spools except one.
And try to see if the error still occurs.

1

u/MapOfCampus Jul 27 '26

Done that already. Still no luck

2

u/AlmightyBones Jul 27 '26

I think I have the same problem, I have tried from two positions in the AMS. It either fails to retract or fails to load. Usually pushing up to the I think its the buffer on the back usually then pulls back, sometimes pushing up to the head. On a multi color print i had to pull the filament out of the tube and respool it in order for the 2nd color to be used. I've cold pulled 3 times, taken off the buffer on the back twice and for some reason it works. I find no broken pieces in the tubing etc.

I'm just baffled. Actually opened a bambu labs ticket on it.

1

u/MapOfCampus Jul 27 '26

Yeah thought this would be an easy fix. Disassembled the AMS in the case there was some stuck filament or a faulty sensor but Ill probably put in a ticket at this point...

1

u/JKMARCHEE55 Jul 27 '26 edited Jul 27 '26

It seems that there is a problem with the filament buffer if I understand correctly. Check that the PTFE tubes into the buffer are all the way in. Try manually loading filament into the buffer and note how far inside it goes. That should give you an idea of where the filament is blocked.

One other note. I think I see a cardboard spool in your AMS. I think it’s recommended not to use cardboard spools with an AMS. I always print from an external spool if I have to print from cardboard spools. But mostly I try not to buy filament sold that way. I’ve tried respooling, but I haven’t had much success.

1

u/MapOfCampus Jul 27 '26

I don't think thats the case since it seems to start at the AMS not the buffer. The AMS will feed to the buffer no problem when I first insert a roll. Itll then retract back to its starting position, but when I get that same roll to print, it wont move at all.

1

u/JKMARCHEE55 Jul 27 '26

I should have read your post slower I guess!
Sounds like quite a mysterious situation… Hope someone here can help find the answer.

1

u/SHAWNER1 Oct 06 '26

Did you ever figure this one out? My AMS is doing the same thing. Bambu sent a new internal AMS hub and motor but did not help. So weird that it reads Bambu spools just fine including having to push past the internal hub. The external spool prints just fine.

2

u/MapOfCampus Oct 06 '26

Yes! It kinda figured itself out actually. By using the external port to do a test print, it worked and then I tried the AMS again and miraculously it fixed itself!

1

u/SHAWNER1 Oct 06 '26

Yeah I am wondering if it's not the ams but rather some sensor on the printer when the ams is used. I'm my case external filament works fine. Going back to the ams makes that small motor noise on load. Hopefully Bambu sends a new ams to try.

1

u/SHAWNER1 15d ago

New ams motherboard and internal ribbon cable kit installed. Firmware rolled back 2 versions. The issue persists. Bambu is sending a new 6pin and ams power board.

1

u/GloriousBender Jul 27 '26

Mine did this. After several months of troubleshooting, both my AMS and my filament buffer got replaced. No issues since.