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 recommend printing them on their side, as shown in the files. The reason mine are facing down in those pictures is because they're still the rails from my very first version, which used more overall filament. I've printed the latest ones in the meantime.