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.
Files printed using a well set slicing app and precise / accurate machine should snap away by hand. Worst case scenario a small amount of persuasion with a craft knife. Try setting your raft to model spacing to 0.27 - 0.29mm.
I hope this helps.