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.
Absolutely possible to gather iron and magnetite from a beach with a magnet. The hard part would be developing a suitable process to evenly disperse the particles in filament, while keeping the particle size small enough to not clog a nozzle. That seems like quite an engineering challenge to me... but anything is doable with enough resources.