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.
Nice print! You could always just jam a wad of folded up paper into the gap between the base ring and the outer sphere. Or if you wanted to drill holes in the tips of the leafs, you could stick in small, thin magnets that would hold it closed.
Note that emmett's original design has a little flat section in the leaf's internal slot that helps hold his open. My design was too small to incorporate that feature.