Problem with strange waves on the second and third layers

Bambu Lab P1 Series Troubleshooting
1
  • Detailed description of the problem
    When printing with a circular pattern, the printer makes strange noises and waves appear on the printed model.
  • Printer model used: P1S
  • Slicer settings used: standard settings with 0.2mm layer
  • Type of filament used: PLA Matte White BambuLab
  • Photos that clearly show the problem are attached.
  • Any potentially useful information that is related to the problem:
    Tried to check grease, cleaned everything as described in the maintenance guide, and greased as needed. Tried to perform a calibration after cleaning and greasing, but it didn’t help - the print head was still “shaking” when moved in the same area and waves appeared again.
    f6fefbd2-381a-445c-b9e9-4c22d276291c
    f6fefbd2-381a-445c-b9e9-4c22d276291c960Ă—1280 135 KB
2

Over-extrusion for short answer.
Just reduce the flow ratio down a bit, like 0.95 to 0.90 for example.
Sometime you have to go extreme and have the flow ratio down to 0.85 to get nice surface but risking under-extrusion. For me, under-extrusion a bit is not that bad, in term of strength of the print.

That’s why people recommend to calibrate flow rate when you change filament, even the same brand same type but different color

1 Like
3

I’ve seen this same thing on some of my prints. I haven’t fully figured it out myself, as I don’t do many thin prints, so it usually cleans itself up with the additional layers on top.

A few potential thoughts:
Is there any chance your PTFE tube has been strapped down too tightly to the chain?
Since you’re printing in PLA, I believe the Aux fan is on by default. Maybe try a print with it disabled.
Is your plate clean? Could be adhesion issues.

Following to hopefully get some more useful answers from others.

4

Here, visualize the problem

Under-extrusion

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image1117Ă—261 1.83 KB

Just right

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image1035Ă—291 1.52 KB

Over-extrusion

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image1993Ă—345 3.97 KB

3 Likes
5

Hello,
Thank you for your answer.
It’s not related to adhesion. I clean the plate with warm water and soap before every print. :slight_smile: I will try to play with the Aux fan.
It is also not as crucial since the next layers were printed just fine, so the model itself was perfect.
I thought that it may be some problems with the hardware so tried to search for some similar cases. Glad to hear I’m not the only one :slight_smile:

6

Hello!
Thank you for such a detailed explanation :slightly_smiling_face: I think it may be the reason because I changed the spool without calibration this time. Will try to calibrate and give feedback here.