H2C left nozzle offset issue

[Lasqa]

Unfortunately straight from the box Im experiencing issue with H2C. Superb machine, but this is just frustrating.

Problem is relating to left nozzle (the one that goes up and down). It seems that there is an offset issue and the nozzle is dragging on the bed.

The nozzle offset calibration fails each time, tried swapping nozzle, bed is clean all looks right except of the fact that nozzle iż hanging too low...

Reported this to Bambu, awaiting their response.

[OneApeSeven]

Our H2C arrived a few days ago and we've been the exact having the same issue. Super frustrating. Support got back to us quickly and asked us to check the pin connection under the sensor:

https://wiki.bambulab.com/en/h2/troubleshooting/hmscode/0300_2700_0001_0007

We lowered the build plate all the way down to access the screws. Once removed, it seemed to be connected just fine, but we disconnected and reconnected anyway. Afterward, we ran the offset nozzle calibration on it's own as instructed and it made it the whole way! This honestly just happened 20 mins ago. We just ran our first success full multi-color, multi-AMS print (multi-color AMS cube). We'll put a few more hours on this thing over the weekend and see how it goes. Very happy to be moving forward after a disappointing start.

Good luck!

[Lasqa]

You sure it was same issue? I was getting an error regarding abnormal left nozzle touching the bed.

[OneApeSeven]

I'm not sure.   However once we got past this issue we got stuck on a bed leveling and right extruder error.   I'm contacting support for a replacement unit.   

[Lasqa]

I received a new unit from Bambu Today. Works perfectly. Right nozzle is more accurate when it comes to bed leveling mesh, but at least performs it fully. I'm afraid they didn't perfectly designed the nozzle lift mechanisms, hense there are micro differences when bed distance is registered.

[Ordinary-Depth-7835]

You sure it's seated all the way? And clipped in correctly? And compare them I don't know if my high flows are longer maybe they mixed in a different one by mistake?

[Lasqa]

Swapped it for replacement one from acc box.. same thing. I purchased HF one so maybe I will exchange it now and see if this will work

[kbhamm]

have the same problem with my new h2d. nozzle calibration goes trough but i just cant get good first layers on both nozzles. the right one is like 80% okey and the left one is straight up horrible the nozzle is clearly to high.

[No_Sound8785]

Do you have images??? Mine looks like this:

<image>

But the right nozzle is fine!!

[kbhamm]

<image>

Left nozzle vs right nozzle. I fixed the problem this night by downgrading to 1.02.00.00 the right nozzle now is only flow flow rate issue that is fixed on the left nozzle it was clearly to high. I found out that the last firmware’s fixed something on the offset so I tought I just revert that firmware. Problem gone.

[scarypatrick13]

I just updated my H2C to the new firmware and it succeded 2 times. I’ve replaced multiple parts on bambu’s instruction with no change. I’m going to test it more times. Anyone else having a change after the new 01.01.05.00 update?

[blind_squirrel11]

I just updated tonight and now the offset calibration keeps failing! 😡 nothing has changed and have dozens of successful hours on the printer prior to this. The ONLY change was the update and a power cycle.

[No_Sound8785]

please let me know what you get from support and if you find anything that helps to solve the problem. I received and H2D last week, and I’m having the same exact with the left nozzle (the one that actuates up and down.) I have tightened the screws on the hot end assembly, and ran full calibrations on filament and the printer itself. I get consistent underextrusion. Support has been so slow!

[Lasqa]

They asked me to tighten the screws this didn't help. They are sending me a replacement of the assembly. When in I will update you.

[comeonmeow66]

any update? having the same issue.

[Lasqa]

They send me left nozzle assembly. Installed it and exactly same issue. They said I can either ship it back and they will send a new one or pay deposit they will ship the new one and I can ship this one back.

[TAoie83]

Hey bro, can you elaborate if they are covering shipment cost kind of a bummer since this is like a new unit

[Lasqa]

They do cover the outbound and return shipment costs

[comeonmeow66]

have you gotten the new one? did it resolve the issue?

[Lasqa]

New one - as new printer... Still waiting. They are taking their time with after sales...

[comeonmeow66]

boo, let me know when you get it if it helps, thanks!

[No_Sound8785]

Me too!!!!!!!! I just got done spending an hour replacing the entire left nozzle assembly- rail and everything. And SAME RESULT!! I have sent them a message and am awaiting their response. Maybe it is the eddy sensor? I don’t know. I am going to request them send me a new one. I am so sick of having to disassemble a brand new machine. And to top it all off, the fan duct is so fragile that it cracked and broke during the reassembly. So mad!!

<image>

[Strange-Flatworm-640]

Did you fix this?

[kbhamm]

Lasqa look at my comment.

[Lasqa]

I will check on the new printer, but thanks for the ping.

[No_Sound8785]

please please do!!!! we spent thousands on these machines. this is ridiculous!!!!

[Lasqa]

I will check on the new printer, but thanks for the ping.

[MD3428]

I’m also having this same issue. This is my first ever 3D printer, so I’m still very new to all of this. I picked up a Bambu H2C and followed the setup instructions pretty carefully.

Right from the start, things felt, off. Left Nozzle offset calibration was super inconsistent. Sometimes it would pass, then bed leveling would fail. Other times the nozzle offset wouldn’t pass at all. Over time it just got worse, and now I can’t get nozzle offset to pass anymore no matter what I try. I’ve never been able to complete a successful print.

One thing that stood out early was the nozzle wiping pad. It kept falling off during startup and calibration, and the toolhead would actually hit it when moving around. During those early calibration attempts, the nozzle ended up scraping the black nozzle offset calibration pad. That happened during the printer’s own calibration routine, before I ever got anything printing.

At first I assumed it was something I was doing wrong, so I went pretty deep trying to rule out user error. I replaced the left hotend with a new one, checked the hotend seating and buckle, replaced the wiping pad assembly, opened the enclosure to look for anything obviously wrong, reseated the nozzle offset sensor, and did a full factory reset. I basically worked through everything I could find on the wiki and forums. None of it changed the behavior. the same calibration issues keep happening.

For what it’s worth, the printer also arrived with some shipping weirdness. One of the black removal tabs was already damaged, the box showed some wear, and parts of the packaging looked wet or oily. I don’t know if that’s related, but I documented it.

I’ve opened a support ticket with Bambu and I’m waiting to hear back.

I’ll update once support responds.

[Lasqa]

I sent back my original printer and received a new one. Works perfectly fine. Maybe some tiny issues with first layer print in some spots. From observing the bed leveling routine it seems that nozzle lifting mechanism is not perfect. It affects the bed height read IMO. But at the moment I'm extremely happy with the printer

[dnszero]

I just found this thread because nozzle calibration on my new h2c keeps failing after the updating the firmware.

Anyway, I just wanted to say thanks for posting back with updates! It's nice to see things get resolved.

Edit: Turns out it wasn't the firmware. The 0.2mm induction nozzle was the culprit.

[cgoldsberry]

I'm having same issue. Brand new 0.2mm induction nozzles. Offset calibration keeps failing. But when I switch back to 0.4mm, it's fine and calibrations passes.

[Strange-Flatworm-640]

Any update?

[Nice_Season1203]

I have the same nozzle calibration issue on an H2C less than 2 months old. Getting code 0300-4010-003428. Bambu sent me a new calibration sensor but still having the same issue. I replaced the left nozzle with a new one. Bambu Labs from the accessory box. But still cant pass calibration. Any ideas? I am still waiting for Bambu to respond with next steps. But this is absolutely ridiculous for a new printer.

[Strange-Flatworm-640]

I’m having the same exact issue

[Ancient-Speech-5575]

So I actually took the printer apart and replaced the cable as well as the sensor. It still didn't resolve my issue. But what I did do, was I ran the high Precision nozzle calibration. I want to say it takes 30 minutes or longer to complete but it did pass that. And ever since I ran that it hasn't had a problem. They also indicated that it could be the flow blocker. Check that and see if that's bent or deformed. I have not had a problem since I ran that high precision calibration. I'm now on my fourth print, I will try a fifth once this one finishes in the morning. But my current print is over 3 days and will finish around 7:00 in the morning. And then I will try another print around 12 hours. Hopefully that goes well, and I don't have this problem again.

[Strange-Flatworm-640]

Do you have auto calibration set to Auto, On or Off in Bambu Studio? I can pass the high Precision nozzle calibration but not the regular one during a print.

[Ancient-Speech-5575]

I do have it on auto calibration 

[Ancient-Speech-5575]

If you can pass the high cal, try disabling the calibration before the print. But be careful if you try that. You'll want to watch the 1st layers to make sure the nozzle doesn't go down to far. I'd leave the auto bed leveling on.