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.
Great idea to split the left and right side up! saves weight as well.
Might I suggest you add these separate files instead of the combined STL (your comment below here)? As they are positioned in there, they are very hard to print because of large overhangs that can't be supported without internal supports. When on their back, they print a lot easier. Especially with 'conical supports' in Cura enabled