visualization of STL surface orientation flipped between machines

[pieper (Steve Pieper (Isomics, Inc.))]

Probably you have different slicer versions. Check this information for guidance:

Exported STL files dont match view in Slicer

Slicer now reads all files in LPS coordinate system. Before Slicer-4.11, it expected STL files to be in RAS coordinate system by default. See more information about how to avoid RAS/LPS mismatch in the migration guide. If there is no LPS/RAS issue but slight position and/or orientation differences then most likely that other software does not properly take into account image origin, spacing, or axis directions of the input volume.