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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It looks like there may be a problem with the STLs in this release. :(

S3D complains about self-intersecting faces on all three rail models, and non-manifold surfaces on rails 1 and 3. It crashes attempting to slice them. Similar results with Slic3r PE and Pathio.

I haven't tried any of the other files yet since I wouldn't be able to get very far without them.