What if - Bed leveling fails?

Bambu Lab A Series Troubleshooting
1

My very first printer i got back in 2018 and 3 screws for you to play around to manually level it.

I now have 2 A1s and 1 A2L.

I know all bambu printers do a bed leveling at the start.

As the title of this post asks, what happens if bed leveling fails? What would happen afterwards?

  • This has NOT happened to me or anything

Thanks

2

You receive an error message: Calibration failed

Fault Code: 0300-4002 \ 0300-4038 - Heat‑bed leveling failed

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3

I’ve gotten this once or twice, make sure the build plate is clean, there are no plastic bits trapped between the bottom of the build plate and the heat bed, (wipe them both clean with a lint-free cloth), and the build plate is properly seated.

If you still have problems, clean the nozzle, (also if X1C clean the Lidar lens), try swapping the hot-end (order spare silicone socks if you order spare hot-ends).

Don’t try manually leveling the bed, you’ll only change things chasing what’s probably a different problem.

4

This has NOT happened to me, just a What if.

Anyway, if it did happen, like you said, it most likely happens cause you have between the build plate and heat bed.

Did not think of that, thanks

5

The bed leveling failed once for me. The build plate looked a little warped, so just put on a new plate and it recalibrated just fine.

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6

It can fail in one of a couple ways:

  1. detected failure, it will throw an error message, and complain to you. 99% of scenarios fall here, bambu firmware really likes its sensor data and does not go happily without it

  2. undetected failure, it will successfully calibrate badly.
    2a) it will set z offset bad, and either fly far above the bed spilling loose spaghetti everywhere, or will dig down too far and destroy your bed.

    image
    image1920Ă—1101 405 KB

    2b) if it gets far enough and creates a bed mesh of bad data, this is what that often looks like. Those are “raised” areas that [faulty] bed mesh sensor said was ++++height. This is unlikely to happen on bambu a1 since it taps to level and the sensor is in the toolhead, it will fail earlier
    image
    image1920Ă—1664 463 KB

    2c) something else :slight_smile:

7

Well, in 2c, I’d say your cheese got moldy.

But I’m still a Newbie with less than 1000 hours. (Ah-Ha! 847 hours so far. I found it! I’ve been printing some equipment racks and totaled up some hours.)