Supports (multimaterial): Changing Top Z distance inhibits bottom interface material change

[Egosumumbravir]

Is there an existing issue for this problem?

• I have searched the existing issues

OrcaSlicer Version

2.2.0

Operating System (OS)

Windows

OS Version

Win10

Additional system information

No response

Printer

Bambu Labs X1C

How to reproduce

Looking to run different materials for support interface - in this case PLA for a PETG print.
Everything worked as expected until test prints suggested that the PETG layer on top of the PLA support interface was a little over squished. I thought it would be an easy fix by just setting a small "Top X Distance" which had the side effect of breaking the bottom support interface.

Please compare the two images

Bug appears to be linked to the support style - Snug is affected while default or grid are not.

Actual results

Alternative material support interface only placed on top of the support.

Expected results

Alternative material support interface on both top and bottom of the support.

Project file & Debug log uploads

Octavia 2025 Shortarse Bracket v3.1 X570DU [[email protected] ORCA 3MF] fault.zip

Checklist of files to include

• Log file
• Project file

Anything else?

No response