Surface defects

Need help troubleshooting this. I was reprinting the same model due to color bleed from insufficient purging. For some reason, on the reprint I got this streaking issue. It’s the same stl and Bambu PETG basic filament. The only differences were changing from the strength to standard profile, and increasing purging and variable thickness (but only higher up where the reprint hadn’t reached yet). I had switched from the printer being on a solid surface to a more wobbly cart as well, so the first skinny reattempt was after placing the printer on the floor. The third was the next day after letting everything cool down.

It’s interesting how the defect is happening in the exact same spots on the repeat attempts.

Thoughts?

Also, filament was dried in a drier and hasn’t left the low humidity AMS between prints.

I figured it out. K value was set at “0”. It must have changed between the first and second prints?! Did a flow calibration, k=0.03. Next print was successful.

1 Like

the same problem
same place
but my filament is kept dry。
PETG should be kept dry,but this is not root of the problem