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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.

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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.