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.
For each of the Objects with an "L" or "R" or "half", you just have to mirror the object to the other side. Also, there is one file that says "3x" (a spine piece I believe) so I just made 3 of them. the 3x piece was symmetric, I didn't mirror those. Hope this helps.