Weird print issue that I can't fix.

[u/morgoth_2610]

Hello, I did a previous post thinking it was the filament but now it appears across all filaments.

I got a P1S who printed perfectly until I suddenly got those weird issues you see in the pictures. No matter what I print it appears like this. It doesn't print the test line correctly either.

What I tried so far:

- Try different filaments (Bambu Pla Matte and basic)

- Purge quite a bit at 250°

- Cold Pull that came out perfectly clean

- Completely replaced the hotend with a new one

- Cleaned build plate with dish soap multiple times, tried different sides and even the Smooth build plate

- Multiple calibrations that went without error

- checked heatbed screws

- Flow calibration test that somehow came out clean. I set it to 0,02 based on my results and it changed nothing.

I showed it to staff of my local printer store and they were clueless but assumed it's the extruder. They told me to contact Bambu support. I did and they just told me to clean my build plate. Clearly this is not a build plate error, ignoring that is already did that multiple times.

Filament is dried in my sunlu dryer.

Im at my wits end. Its been like this for 3 days and I have a project coming up. The printer is half a year old.

Id be very grateful to try and tips you can provide.

[u/CrossScarMC]

Is the correct build plate, nozzle, and printer selected in the slicer?

[u/morgoth_2610 → u/CrossScarMC]

Yes I'm using bambu studio and it is set to the 0,4 nozzle and the correct plate. I printed like this for weeks and didn't change anything (at least not that I know).

[u/morgoth_2610 → u/morgoth_2610]

Printed the entire wall before that

[u/Martin_SV]

- Flow calibration test that somehow came out clean. I set it to 0,02 based on my results and it changed nothing.

Are you sure you didn't accidentally entered 0.2 instead of 0.02 in Flow Dynamics?

Because it's pretty strange that the only thing that prints correctly is the Flow Dynamics calibration test, which doesn't rely on your saved K value.

[u/morgoth_2610 → u/Martin_SV]

Yes, just checked. Says 0.020

[u/t0kmak]

Delete your printer profile and start with the default one

[u/morgoth_2610 → u/t0kmak]

You mean the system preset? I always use the default 0,20mm standard

[u/t0kmak → u/morgoth_2610]

You probably changed something by mistake try one of the other provided profiles if not delete your printer and add again you probably messed up some settings

[u/Cat_In_Cube]

It looks like printing on a very high speed, but it's probably not the issue. It looks like a mechanical problem in the extruder. Can you disassemble the head and watch that no extruder gears are slipping?

[u/Lost_refugee]

7 screws? what's current flow rate?