Hello guys.
So I’ve had this problem for a couples of days and I don’t know what else to do. I have tried everything and nothing fixs it.
I have two BambuLab P1S with AMS. I use the same PLA filament in both of them. Same brand, same color, same everything. So, one of them (the right one in the picture below) is having this artifacts that I think it’s called Z Banding, but I’m not sure. The other one is giving me awesome results, partially.
To the left, machine nº1 producing excelent walls. To the right, machine nº2 with Z Banding.
The same prints, but from the side.
The pattern is only visible in tall print like this bookend support. I know it is a tall and thin print, but it has been printing great since the very beginning. It’s now that I’m having problems with the vertical artifacts in machine nº2. I did nothing, it just appeared.
The thing is, I though one reason might be a badly calibrated PLA, so I calibrated it using machine nº2 and this is the result:
To the left, machine nº1. with overextrusion. To the right, machine nº2 with perfect extrusion.
So, I have this absurd situation:
- Machine nº1: no Z Banding, but overextrusion with calibrated filament.
- With the default BambuLab PLA Basic profile I have the same exact results, but without overextrusion.
- Machine nº2: Z Banding, but perfect extrusion with calibrated filament.
- With the default BambuLab PLA Basic profile I have the same exact results, but with underextrusion.
Printing settings in Bambu Studio, the same in both machines:
- Outer wall: 200 mm/s
- Inner wall: 300 mm/s
- Infill: 250 mm/s
- Acceleration: as default: 10.000, 500, 5.000, 0, 2.000 and 100%.
- This values have given me excelent results, until now.
I have also made a VFA test with this result:
Machine nº1, with BambuLab PLA Basic default profile
Machine nº2, with BambuLab PLA Basic default profile
I have tried everything in machine nº2 in order to fix this problem:
- Clean the X-axis carbon rods with IPA
- Greasing Z-Axis Lead Screws
- Cleaning and lubbing Y-axis and Z-Axis Linear Rods and Bearings
- Changing the extruder with a new one.
- Lubbed idler pulley
- Tensioned the belt following the official steps Belt tensioning procedure | Bambu Lab Wiki and also centering the belts.
Nothing fixes this problem. Nothing, and I don’t know what else to do.
Do you have any idea? Thanks in advance 
