MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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Thank you so much!
Found the error. S3D in Version 4.1.0 sets the Support lines different than Version 4.0.0. Even if all settings are identical!
Switched back to 4.0.0 and used some of your settings. Looks definitely better than before.
Will post a MAKE when everything is finished