Hi Bob, well the 3MF file is still going to contain inside of it the same triangulated mesh data as STL format does.
Since it will have the same geometry there isn't any way that 3MF files are going to be smoother than STL files.
The new functionality in 3MF is more about supporting things like components and name labels and various organizational things like that as far as I can tell, and support for embedded thumbnail images and colored faces. There isn't anything different from STL format in the area of smoothness or actual fundamental geometry content.
So supporting 3MF would not make any differences in the particular area that you're interested in, at least as far as I know.
- Michael
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