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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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Thanks! I think I used 20% infill for my print. Can't say if you need higher when scaling up, you should check how the infill lays under the small flat surfaces like stairs so they'll have enough support and you won't have holes on the surface at those parts.