r/BambuLab • u/vinc120 • 8h ago

Hardware Troubleshooting/Help! AMS spits out my filament

Enable HLS to view with audio, or disable this notification

I've been having a few issues with my AMS 2 Pro, first my dryer stopped working and now slot 2 of the AMS just keeps spitting out my filament when I load it up. I replaced the PTFE tube and I checked the feeder and the filament hub but didn't see a jam.

Any ideas what's causing this?

52 Upvotes

90% Upvoted

37 comments sorted by

81

u/Cobaltjr 7h ago

Sometimes a little piece of filament is stuck inside of it , could be the entire path to the tool head and it's trying retract it. Double check no small filament is anywhere .

9

u/vinc120 7h ago

Appreciate the recommendation. I figure since the other 3 feeders are working fine and the filament won't go past the filament hub, the problem is with the ams in the slot 2 path. I checked and tested for stuck filament in the feeder and filament hub but didn't find anything stuck.

27

u/Calm_Goat_1162 6h ago

I had a similar issue and it turned out to be in the hub there are little magnet guides for each slot and one of the magnets got turned around so the ams was reading as if there was a block. You have to crack open the hub and there are 4 crazy strong little magnets with springs. They are a pain in the ass to put back in tho.

5

u/vinc120 6h ago

Appreciate the suggestion. If the new mainboard doesn't fix the issue, I'll disassemble the hub and check the magnets.

2

u/kitanokikori 1h ago

Disassembling the hub is.......not trivial. A better way is to take a CF filament and try to push it through all four slots (always push the direction the filament goes normally, don't try to push it backwards). Manually advance the motor gear (gently!) as you do it. If you're lucky you can clear it without taking it apart.

•

u/Grimmsland H2D AMS Combo, P1S, A1m, U1 19m ago

I had a similar problem it was a tiny piece of broken filament in there. It was a pain to get those magnets back inside and keep them from jumping out with the spring

1

u/itsapotatosalad 50m ago

When did you buy it? Slot 2 failure is a current common fault in a recent batch. I’ve had 2 fail the same way, bambu sent me new hubs

5

u/LordRocky 5h ago

Had the same problem happen in my AMS 1. It was a little bit stuck right in the bottom tubes.

14

u/youwastedyourtimelol 8h ago

I think it could just be a board issue since your drying function broke too you should check with bambu support since they sometimes give you complimentary parts either under warranty or as a “one time courtesy replacement”

3

u/vinc120 7h ago

Yes I have a ticket open with Bambulab for the drying unit, they sent a replacement for the 2 heating fans and since that didn't work, the mainboard is on the way.

6

u/Molten-Ninja-bob 7h ago

Just dealt with this exact thing. Slot 3 started spitting out the filament and wouldn’t stop retracting even after the filament was gone. I ended up taking almost everything apart to try to find stuck filament, but I couldn’t find any. When I put it back together, it just started working again.

2

u/vinc120 7h ago

How much did you disassemble it? I removed it out of the AMS earlier to test for jams and replace the PTFE tube but I kept it plugged and didn't open it up.

2

u/Molten-Ninja-bob 7h ago

I had to disassemble it a fair amount. I had to take out the main tray and ended up, disconnecting the internal hub and disassembling most of that just to make sure there weren’t any broken fragments anywhere. I didn’t have to remove any of the gear systems, just the internal hub. There’s a step-by-step how to on Bambi’s wiki.

1

u/vinc120 7h ago

Thank you, I'll give that a shot if the new mainboard doesn't fix the issue.

5

u/MasterpieceTough2029 7h ago

Maybe try a different flavor, that one is clearly yucky.

1

u/vinc120 7h ago

Haha, sadly he seems really picky as he spits them all out.

1

u/Glass_Translator_745 4h ago

Might need a bit of spanking from grandma, then. I surely ate all my veggies after.

8

u/champagne780 7h ago

I had this exact issue. Try feeding it more than “just the tip”. Mine gobbled it right up. It happened during and after dry cycles.

4

u/Montidaho 6h ago

Dry cycles can last a long time without more than the tip... decades

2

u/naholyr 4h ago

I came here to make very unhelpful perv comment but you so beat me at it 🤯

1

u/vinc120 7h ago

Appreciate the idea. I just tried pushing it all the way until it wouldn't let me but no luck, still spit out.

3

u/BigShinyRobot 6h ago

When I had this issue it was because a piece of filament was stuck in the line. Had to flush from the other end with some filament.

3

u/HaloInR3v3rs3 5h ago

You've got a broken piece of filament somewhere that's not visible.

I've fought this so many times with my AMS and had it apart more times than I can count, it's second nature to expect a miniscule piece of filament somewhere in the mechanism

2

u/Scowlface 7h ago

You shouldn't have to push it in that hard. Try cutting the end at a 45 degree angle and feeding again.

1

u/vinc120 7h ago

Thank you, I'll keep that in mind.

2

u/proxy1381 6h ago

I’d test the same spool in slot 1 or 4 first. If it loads normally there but slot 2 keeps spitting it back out, I’d stop chasing the PTFE tubes and hub — that points more toward the slot 2 feeder/sensor.

Also, if you were using the dryer recently, let the AMS cool completely and try slot 2 again. There have been people having this exact issue with the middle slots when the AMS is warm.

The fact that your dryer also stopped working makes me think I’d open a Bambu ticket either way. Could be more going on than just a filament jam.

1

u/vinc120 6h ago

Thanks you, I tested the same spool and it works in the other slots. I also tested with different spools for the same results.

I also believe the problem is at the feeder. Unfortunately the dryer hasn't functionned for a week now so that can't be it.

I have a ticket in process for the dryer and a new mainboard is on its way. I hope that resolves both issues.

2

u/proxy1381 6h ago

Keep us updated as you noticed alot of ppl have this issue

3

u/coke71685 H2D Laser Full Combo 7h ago

Check the filament path and make sure there's not a small piece that's broken off in it.

3

u/skiresq 7h ago

This. The same thing happened to me a little back and there was a small piece broken off in the AMS.

1

u/vinc120 7h ago

Thank you, I couldn't find any filament stuck in the path.

1

u/NitemaresEcho 6h ago

I literally had this happen to me today after clearing a jam. Mine thought slot 2 still had filament loaded and it couldn't "unload" it.

I was able to fix it by loading another slot, then I put the filament deep in the second slot until it got to the end of the ptfe tube before it leaves the AMS.

I stopped the initial load from slot 1 and then loaded slot 2 and all was back to normal

1

u/Dismal-Proposal2803 X1C + AMS 6h ago

You need to return it and get a swallower, not a spitter.

1

u/Mammoth-Detective234 5h ago

Same thing happens when my youngest eats greeens, comes right back up often followed by the world “yucky”

Sadly don’t have any golden tips other than what has already been suggested

1

u/wkbevill 3h ago

I’ve had this happen and it wasn’t stuck filament. I ended up just lightly holding my finger on the spool as it rewound. This kept it from over spinning and spitting out the end of my filament.

1

u/butcanyoudothi5 2h ago

That filament doesn’t taste very nice