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.
Here is the file you asked for. Let me know how it works for you. I printed this part at .2mm layer height, 20% infill, 60mm/sec. The print time was about 19.25 hours (I think..)