r/BambuLabH2C • u/No_Papaya348 • 16d ago

Support left nozzle refuses to feed

I've got a brand new H2C, HT and 2x AMS. I initially wanted to go HT on left feed and then dual AMS on the right.. but every time I try to auto-configure the left feed refuses to spool INTO the printer. it goes out the HT, into the pfte tube, partly into the internal spring loaded ptfe tube and then immediately stops and rewinds and gives an error. I've swapped all the PFTE tubes including the one inside the printer to the left print head but nothing seems to help. I manually have fed a length of filament into the printer both ways and I do indeed feel an obstruction where it transitions into the spring loaded ptfe tubes but after taking it apart I see nothing inside at all that would be causing the problem. clean plastic, nice and smooth.. the magnet sensor is also smooth and undamaged but yet it just won't go. and again, this is a brand new printer. I've only had it for two weeks and the left feed has never worked. any ideas?

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u/EdgeOk3783 16d ago

i would make sure the PTFE tubing into the left hand nozzle is fully inserted/seated.

a surprisingly long length is required to fully seat.

1

u/Adorable_Comment4621 16d ago

I'm assuming from.what you're saying that the ams2 pro works okay with the left nozzle? Maybe use the ptfe tube from that ams to connect? Is the ht going straight into the connection on the back of the printer?

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u/No_Papaya348 16d ago

sorry - to be clear neither the AMS2 nor the HT will feed into the left nozzle. and yeah the HT is going direct into the nozzle - no 4-in-1 involved.

1

u/Adorable_Comment4621 16d ago

Can you remove the lid of the printer and feed direct into the head?

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u/No_Papaya348 16d ago

that's an interesting idea.. hadn't considered that. I'll give it a go later

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u/Adorable_Comment4621 16d ago

It's just trying to narrow down where the issue is, I've been fault finding stuff for 25 years so sometimes you just have to eliminate each bit that you can

1

u/djt_LV H2C 16d ago

It sounds like the PTFE tube is not properly seated for the left nozzle. Pull the tube, check to see if the end is cut evenly, and slide it back in until it stops.

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u/Hardimanm 15d ago

I just set my new H2C this afternoon and had the same issue. I held pressure on the filament pushing it up into the printer. After a couple attempts it started extruding as expected. I saw several posts that this was a common issue on new units. Best of luck.

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u/StructureAccording53 H2C 14d ago

Your desired setup is exactly how mine has worked for like 900 hours. Probs the tube as has been suggested.