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.
I just uploaded 4 new test fit STL that use much less material and print fairly quick. The instructions have also been updated to (try to) explain how to use them to scale the "real" STL and get a nice fit.
Sorry for the troubles and thanks a lot for pointing this out!!