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 does take a little bit of prying to get the outer ring broken free. (Although first preview your g-code to make sure there is one blank layer between the outer ring and the base - otherwise it'll be hopelessly fused together.) See the video link in kaliz's comment below for how to break the ring free. If your print is breaking, you may not have sufficiently fused layers and may need to print a little hotter or a little slower.