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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That's awesome! I made them in CAD using pictures of Rolls-Royce and GE engine fans for reference. The blades are basically multi-section lofts with leading and trailing edges defined in 2 views (front and side). They look complicated but are actually pretty simple.