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.
hehe i did that 2 xD xD
you need to download and install "Cura" and setup your printer.
now, open the .STL file in "Cura" and click "prepare" and THEN hit save, save this on Your SD card. tadaaaaa!!! :D