Printer Failing and cancelling towards the end of long prints(6+hrs)

Bambu Lab H2 Series
1

Hi Bambu Friends,
I’m very new to 3D printing and running into a frustrating issue with my new H2D. I have had the printer about a month and recently, during the end of prints 8ish hours long, it will fail without a specific error. The Light on the bed will start blinking and some times the lights on the AMS2 will blink as well. The only way to fix the issue is to hard power down the printer. after powering back up the printer seems to work fine other then unloading the filament using the AMS. Bambu Handy shows that the print was cancelled(not done by me) or Failed without a specific error. If I leave Bambu studio on during the print after the failure the printer is just N/A. the printer lcd will say print cancelled or failed with no error codes. The AMS will not show on the LCD until the printer is rebooted.

It seems to have no issue for short prints. I have performed a few test prints to make sure the nozzle work fine In between failures. I believe at some point I was able to print 8+ hours but this week it has always failed.

Things I have tried that don’t change the outcome:
1.Printing with and without a sdcard.
2.I have 2 AMS2 PRO’s, I have tried them separate, together and with different 6 pin cables.
3. running all the calibrations again.
4. Disable build plate detections.
5. I have looked at other posts on this forum and reddit, but the effected printers all seem to be other models and the solutions did not work for me.
6. It has happened on 2 different models downloaded from makers world. each model has failed 2-3 times
7. I have used the same roll of Bambu ASA filament, I have dried it using both of the AMS 2 to 10%rh about 9ish hours twice.

p.s
Going to try and perform a factory reset next. I have opened a support ticket waiting for a reply, but would love to hear any suggestions on what else I can check.

I have read that doing a firmware downgrade may help but this seems to not be an option on the H2D? I know the firmware that came with the H2D was not 01.02 but I’m not sure if I ran the printer for long prints on the previous versions. I think I have performed a firmware update twice(on setup) and to 01.02, but did not pay attention to the firmware versions while updating

Thanks
-Kenichi

2

Welcome to the forum Kenichi!

It’s always tough with no error codes. I see you were going to do a factory reset, I would definittely give that a try. Also you can downgrade the firmware if you want to try that. Just go on the Handy app, select the H2D, click the settings (hamburger) menu at the top right. Then click “Firmware Version”, scroll down to the very bottom and select “I want to downgrade to a previous version”. Select the one you want and then click “Install this version”.

If neither of those work you might have to wait for the ticket you opened. They will ask for the printer logs and they will hopefully be able to see something we can’t… then send you some replacement parts.

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Thanks McGee for the Firmware downgrade info and making me feel welcome! I just finished the factory reset and kicked off the Print again this time using PLA, ran out of ASA from all the testing😭.
Hopefully that will fix it. I will update the post with updated info and hopefully a fix to help others that may run into this issue.
Have a great weekend!

1 Like
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You’re welcome. Sounds like a plan. You have a great weekend as well!