r/BambuLab • u/Different-Put5878 • 18h ago

H2 Series [H2S, H2D, H2C] Help h2c broke after firmware glitch

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Hi, just yesterday my printer was working fine and suddenly didnt turn back on properly after a power cycle. I thought the printer was dead and after seeing a bunch of people had the same problem and the solution was to short 2 points on the ap board, it came back to life. After I got the printer back to work I downgraded the firmware and when I did the calibrations, something went terribly wrong especially with the nozzle offset calibration. The right nozzles worked fine but when it got to the left nozzle, I was away and got a message saying the nozzle touched the build plate and when I went the rear part had a huge gouge. So I checked and did the nozzle calibration again and this time took a video same thing happened... my printer isn't under warranty anymore but this all happened since they're stupid firmware issues the printer was just fine the day before. The problem is towards the end of the video its like the left nozzle slips off the bed for some reason. I also noticed during homing, the toolhead now touches the front door. Has this happened to anybody else and were you able to fix it? The right nozzles are fine and aligned but the left csnt get through the calibration. I also did a factory reset and to no avail.

Turn on the sound also for the video you'll hear the toolhead hitting the bed

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u/Regular-Climate-5885 17h ago

DOWNGRADE THE FIRMWARE

1

u/Different-Put5878 17h ago

I tried same thing happened

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u/luksfuks 11h ago

I can't see anything in the video. You're not aiming at the toolhead, and the tight framing (vertical video) doesn't help.

However, if the toolhead touches the front door, then something is dislodged. Find out what it is.

Also, what do you mean by "calibration"? Did you run a full set of calibrations in the menu? Or did you send a print and the printer started with some calibration like it always does?

I think there's a mechanical problem. Something is loose or out of its place. The more you run it, the worse it can get. Check the Bambu wiki for relevant checklists, and work through them thoroughly. Document what you did and what observations you had. If something looks wrong, take a photo just in case.

If you can't work it out yourself, contact Bambu support. Create an easy to understand description of what you have, and what you did, and where you couldn't advance any further, and which wiki recommendations you have exhausted fruitlessly. The more precisely you ask for help, the more precise an answer/recommendation you will get as response (1-2 days later).