Export stl issue with meshmixer or other softwares

Operating system:
Slicer version:503
why the export in stl is not done as before see pictures
thank you
should I reinstall 3Dslicer

It looks like the surface normals are inside out. Perhaps you applied a transform to the model in Slicer that turned the model inside out. Anyway, you can always recompute/reorient normals in Surface Toolbox module.

Always use the latest version of Slicer. In general, use the latest Slicer Stable Release, but if you need some most recent feature or fixe then the latest Slicer Preview Release.

Thanks a lot

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