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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I don't remember Tom saying why, but if nothing else, it is a LOT easier to hand fit a square 3D printed piston and bore than it is if they are round. They are much more accurately printed in the first place.