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 have redirected my question to https://www.thingiverse.com/thing:2147061.
BTW I have printed the engine and am very happy with the quality and attention to detail you provided.
I admire your talent and dedication in designing this model. Thanks very much for making it available to us.