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.
screencast.com seems to need adobe flash installed, which I don't have. But if you don't see a gap, it could be that your layer height is too thick. What layer resolution are you using? I recommend using 0.2mm as that should guarantee that your slicer produces a gap.