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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I have now added a variable AddTrianges which is by default 1.
Set it to 0 to remove the Triangles.
I'm afraid "I also get a thin front I can't get rid of" doesn't tell me anything.
What settings are you using for the variables.
P.S. You can now use the MakerBot Customizer application.