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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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I went back and looked at the STL file in another viewer and I see what he means. I thought he meant the detail on the RR wheels. Its the tread pattern on the tires. If you look at the pic my tires came out smooth and should have had a pattern around the sides.