Very bad marks on the top surface

Bambu Lab A Series Troubleshooting
1

Hi tehre,

I printed out some parts with ironing on the top surface. They were marked badly, making some strange lines and even some areas have lots of problems. I attached some pictures.

Before starting I made a vertical calibration of the machine (in the printer menu) and I always make all the tests before starting to print.

It’s an A1 printer, with the standard 0.4 nozzle

I used Bambu Studio with the 0.2 standard profile

This is PLA from esun

thanks

PXL_20251017_093725897
PXL_20251017_0937258971920×1080 162 KB

PXL_20251017_093712781
PXL_20251017_0937127811920×1080 141 KB

2

Did you start with the filament profiles you can download from eSun? I had some similar problems until I used their profiles, and it made a huge difference. After I installed the eSun profiles on my A1 I used the automatic calibration to get a better K factor set, turned off the automatic flow control and eSun prints beautifully for me on the A1. 3D Printing Settings |

3

This area looks like the part isn’t flat on the top. The top surface would normally be one continuous extrusion, not one with multiple outside walls.

PXL_20251017_093725897
PXL_20251017_0937258971045×709 153 KB

What does the preview look like in Bambu Studio?