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.
It is certainly possible to print the cover without a raft, but I had some warping issues when printing without it. It's such a small print you could try without rafts and just watch it. If it isn't warping after getting about halfway done, you should be okay.