Anyone else finding the H2D extruder to be easily jammed?
I’ve been able to clear mine by pulling out the ptfe tube and pushing a length of filament through to the nozzle; maybe 4-5 times in the last month of so… But today, both nozzle paths are failing with an AMS placed right on top of the printer.
I looked at a replacement assembly but they are way to expensive to just replace…
I’m asking before I take it all apart to see if I can spot a cause…
It can happen on any printer if you dont let it cool down going from high temp to low temp filament, or if you dont flush a high temp material like PC, PPA, PPS with some cleaning filament and try to print PLA. I had it happen twice now in 250 hours, but was my fault for not letting it cool down. Thankfully even though the extruder is very complex, you can clear most clogs by removing the filament guide, just a few screws.
Thanks for that maximit. I’ll have a look after my meetings today.
Is it jamming with TPU? If so, there is a suggested nozzle for it because the other path is prone to letting TPU wonder.
It wont let you print TPU with the wrong nozzle, you will get an error. Same for PPA/PPS in the wrong nozzle.
PETG actually. But thanks
As mentioned earlier in the thread, clogs can happen for a variety of reasons. I once switched from PAHT-CF to PLA without letting everything cool down—and ended up with a clog from hell in my extruder! The PLA looked like it was trying to escape the hotend like its life depended on it.
Update: I’m able to manually push filament through the extruder and nozzle. So nozzles are not clogged. But, there is resistance as the filament moves into the first part of the extruder. Smooth sailing once past that. I’m thinking that it’s something about the H2d extruder. I’m planning on taking it apart, hopefully finding broken bits and removing whatever then reassembling tonight.
If there is a broken piece of filament in the gear, as the front is skeletonized, you might be able to remove it with some tweezers without taking it apart, if you see it.
Ah! Great thought. That disassembly video with those little cable connectors look worth avoiding.
Thank you.
Solved!
I was really trying to avoid taking the Extruder apart.
Then found and used BL’s AI support feature
I entered the error code “HMS_0700-4000-0002-0004: The filament buffer signal is abnormal; the spring may be stuck, or the filament may be tangled. | Bambu Lab Wiki”
It suggested
Update: I’ve still been struggling with AMS feed issues. I found this 2 year old reddit suggestion and gave it a try. It works great! I used BL 4 into 1 adaptors and couplers plus I used some dry lube on the AMS hub slides as well.
Bambu 4-in-1 PTFE Adapter | Bambu Lab USA Store PTFE Tube Coupler | Bambu Lab USA Store
https://www.reddit.com/r/BambuLab/comments/174au97/news_flash_you_dont_need_the_ams_hub_at_all/
AMS hub is NOT compatible with H2D and not needed on it! If you are using a hub on the H2D that is most likely the cause of all your problems and error codes.
You only need to run the 4-1 splitter on the H2D as the buffers are built into the printer, no external buffer needed. A big clue is that there is no place on H2D to attach the external buffer.
My bad 
My old man confusion is showing on this one.
I’ve had similar problems on both X1C and H2D. The cable swap appears to have fixed my H2d AMS issue. But I’ve rearranged my X1 and found a similar problem. In this case, I suspected my PTFE lines and AMS hub were the worry as I could hear the AMS motor struggle as the filament passed through the AMS stock AMS hub then slow down more as the it made it’s way to the extruder. I used the above mentioned solution for this along with shortened lines and disconnects to allow for sliding out the AMS units for access.
You have to be careful, I bought some aftermarket clear PTFE lines are they were very bad and high friction, would not allow for filament to slide smoothly inside them.
On the X1 you need to make sure the PTFE line from the buffer has enough slack so it can move back and forth as the buffers does its thing.
You also want to make sure the tubes dont have any sharp turns in them. Basically anything that creates extra friction can cause problems in the PTFE path.
Good advice maximit
Thank you
Hey so I’m having a similar issue. Hard to get the filament to feed initially but once it’s in I can clearly see it’s not clogged.
I swapped my ptfe tube out for a stock Bambu one. No dice.
Have you tried swapping ams cables?
Otherwise, I had good luck with the BL tech support AI chatbot.
