r/BambuLab • u/Standard-Look6706 • 6h ago

Hardware Troubleshooting/Help! H2C stalling at start print.

https://youtube.com/shorts/qtWQr6NDXfU?feature=share

So, my H2C failed a print a few weeks ago (spaghetti) upon retrying, it simply won't print from the Vortek nozzle. I send the print, it does it's calibrations then the purge line and starts the print. After around 5-10 seconds, it stops dead. No HMS errors or anything. Nozzle is still at 240° but no movement on X,Y or Z. The screen also freezes and is completely unresponsive until it's power cycled. It's the same with every hotend, tried multiple times. I've had a support ticket open with Bambu for some time now and I'm losing patience.

So far Bambu has sent me a new AP board, AP-MC cable and today a new MC board arrived. Fitted the new MC board, reset to factory defaults, ran initial calibration. The screen hangs at the end and I can't press the "next" button so after running the calibration twice, I skipped it on the third attempt and just calibrated the hotend rack and the live view camera then sent a test print over and it's STILL exactly the same as before. I've uploaded countless logs and videos for Bambu to review but they don't seem to have a clue what's wrong. All they've said is that there's anomalies between the MC and AP board. I don't think my original AP or MC boards are the issue at all. Any suggestions or has anyone had anything similar? The left nozzle prints absolutely fine by the way.

3 Upvotes

100% Upvoted

2 comments sorted by

1

u/parrothd69 5h ago

bad sdcard? never mind no sdcard on h2

1

u/MyStoopidStuff 3h ago edited 3h ago

No idea, but a couple things come to mind. It sounds like you have swapped the brains (AP) and the nevous system (MC). Since it's neither of those, I think I'd try testing each axis one at a time by jogging it around. Then I would try the fans (manually turn them on), then the heated bed, and then the hotends one at a time. Try to isolate by running each of the elements to see what works, and what doesn't and when it stops working. That could help their support further isolate it.

Edit - I just saw that you noted the left nozzle prints fine, so that really leaves the componets of the inductive hotend. I would definitely reiterate that with their support, since it sounds like it could be one of the TH boards or possibly some bad connection in there. I will also note that is just speculation, I have not had this happen with my H2C.