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.
Sorry, there is a wrong orientation of the normals. In simplify3d use (menu repair) flip surface orientation on the two arms.
Place the arm on the plate and set the pillars resolution at 1 mm.
I will modify the file of the arm soon.