Can't print this conical part without defects

Bambu Lab P Series Troubleshooting
1

I tried to print this lid part from MakerWorld multiple times with different filaments, but it will always show the same defects:

image
image712×476 57.1 KB

image
image1595×1103 194 KB

image
image1537×1183 320 KB

I tried a similar part, but same issue:

image
image1536×1162 279 KB

Any idea?

2

Do a pressure advance calibration, and make sure your filament is able to feed into the printer very freely.

Also, please post your 3mf file here and we can take a look, it also could be related to bad scarf seam settings, but do the first two things first.

3

I already linked the file in my post:

4

Is this a PETG print? The defect is quite common when printing with moist PETG and/or too fast.

:four_leaf_clover: & :crossed_fingers:

5

Both PLA and PETG, doesn’t make a difference.

6

Try adaptive layerhight…..25

7

What exactly do you mean by that? Where can I set “Adaptive Layerheight” to “25”?

8

Have you tried using the ‘nearest’ option on the seam rather than aligned? It won’t necessarily make the blemishes go away but will spread them around so that they are not so noticeable.

9

In that case it looks like that, is that even normal?

image
image1280×960 126 KB

image
image1280×960 134 KB

10

To be honest, these look like classic cases of moist filament and a lack of calibration.

While a P2 can take care of flow dynamics calibration, a P1 can not and calibration needs to be done manually.

Filament Drying Recommendations | Bambu Lab Wiki
Flow Dynamics Calibration | Bambu Lab Wiki
Flow Rate Calibration | Bambu Lab Wiki

If the issue still exists, we can look at seam settings, speeds, retract/wipe,… But filament drying and calibration need to be done beforehand.

:four_leaf_clover: & :crossed_fingers:

2 Likes
11

I can try to dry the filament, but I am 90% sure that this isn’t the reason. The PLA filaments I use never at all had shown such prominent defects (see first post) due to moist. I’m doing 3D printing since 5 years and never had to dry PLA or use any calibrations—other filaments are a different story of course.

12

Give it a go. I have to dry all of my PETG and got into the habbit with PLA as well.

The defects visible in the pics are typical of moisture (all of them due to the strong effect of moisture on thermal properties), a lack of flow dynamics calibration (faulty pressure advance showing at the back and random seams) and moisture/too fast a printing speed (inner circle outer line pull-in).

:crossed_fingers: & :four_leaf_clover:

13

Hi!

I have some news. Drying the filament over night didn’t change anything as expected:

0.16 mm High Quality (as configured in the file here):

image
image960×1280 232 KB

I now tried the 0.20 mm Standard preset. In that case, the issue is way less prominent but it is still not perfect:

image
image1280×1179 229 KB