AMS Filament selection causes layer shift

[Xerses1st]

Bambu Studio Version

1.8.4.51

Where is the application from?

Bambu Lab Official website

OS version

Windows 11 Pro 22H2

Additional system information

CPU: Intel Xeon E5-2699v3 @ 2.30GHz Memory: 32GB ECC Display Card: Gigabyte GTX 1660 Ti with 6GB GDDR6 running on nVidia driver 546.01

Printer

Bambu Lab P1S

How to reproduce

This issue was produced using the STL files found here: https://www.printables.com/model/130607-amazon-echo-dot-3rd-gen-tie-fighter/files The files that reproduce the print error every time are:

• tie_fighter_Alexa_front_Cockpit.stl
• tie_fighter_Alexa_center_Cockpit_1.stl
• tie_fighter_Alexa_rear_Cockpit.stl
• tie_fighter_Alexa_center_Cockpit_2.stl

1. Create new project
2. Drop the STL file onto the workplate
3. Use 0.2 Standard
4. Choose AMS slot 2 (gray) for the object
5. Paint parts of the object black (AMS slot 1)
6. Using supports, either normal auto, or tree auto, makes no difference with regards to the print issue. I choose tree because it is better and faster.
7. Print the object.

Actual results

When the object prints, when the printer gets to the layer where the color changes from gray to black, the following layers are all shifted to one side, offset from the initial layers.

Expected results

The layers should be aligned and the print should be the same as if one color was used to print the entire file.

Project file & Debug log uploads

Tie Fighter Cockpit Front Parts.zip This is the current project file I got the result with, but can recreate a new project and it will do the same thing.

Checklist of files to include

• [ ] Log file
• [X] Project file

[BambulabRobot]

This issue has been marked as inactive due to no response for 90 days.