Today I stumbled on AspexSoftware's fablab ModelMaker
http://www.aspexsoftware.com/fab_at_school.htm
The software mostly is about making paper craft models, but that link
indicates the package can output STL
They show it with a variant of the Fab@Home printer called Fab@School
If it outputs STL, then we should be able to bring it into Makerbot
production stream.
The whole Aspex Software site looks like a great resource for
educational use of desktop engineering/manufacturing.