Bambu P1S print is consistently offset/skewed

Bambu Lab P Series Troubleshooting
1

I’ve had my P1S for about 18 months and it’s been great overall. Recently I have had a problem that has me stumped.

Initially I was getting some prints that would seem to shift/skew at a random height. Eventually I found that the bed had some side to side wobble which I figured was causing it. (See video in Imgur link above)

I found which bolts will make the print bed stay in place with no wobble. After tightening those, though, I get a consistent offset, even at the first layer. (See image in Imgur – this is happening every single time.)

Things I’ve tried also include

  • bed tensioning test per Bambu wiki
  • cleaning the carbon rods
  • printing much more slowly
  • brand new sdcard

Does anyone have any other suggestions for getting this working?

2

61ed00c0-94e1-11f0-bd7a-c7784bc31c9c
61ed00c0-94e1-11f0-bd7a-c7784bc31c9c1920×3413 1.2 MB

First time posting and I didn’t realize what it would do with the Imgur link. It looks to have embedded the video. This reply should have the 2nd image I was trying to provide.

3

Did you run a machine calibration after tightening the bolts?

4

Good question! Answer, yes I did.

5

Do you have a small square (90 deg) to check the rod is perpendicular in X & Y? You would have to run the bed to the top to check with the base as a reference.

You might review the heated bed replacement wiki to see what things they reference to verify it is in alignment.

6

You also probably need to replace the ball bearing at the top of right lead screw

7

Did you find all six heat bed screws?

image
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8

Interesting, I’ll check for this.

Okay so at the top of at least the two threaded rods in the front, they seem to have a really flimsy rubber cover on them and nothing else. I didn’t see any ball bearings at all. Do you know if there’s a document about these ball bearings somewhere?

Yes, I confirmed all six are tight.

9

Sorry, I don’t.

But here what it looks like

image
image1920×2560 313 KB

10

oh I see, I guess that’s more of a roller bearing? I’ll keep that in mind as possibly needing a replacement.

11

This was a good idea to check. The wiki says basically to pull the bed all the way forward. Unfortunately, doing this didn’t change the problem.

12

I thought I would post a general update here since my support ticket has had some updates, though I would not say things are resolved yet.

Basically what we’ve found is that the printer seems to work okay if there’s only one model on the print bed, but as soon as I add a second model, the layer shift happens every time.

I don’t know if there’s a known situation that covers this, but just in case that rings any bells for anyone, let me know! Or, hopefully official support has some idea of how to fix it. They are responding steadily, but not necessarily quickly.