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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 had the same question and Eric mentioned he got his from Amazon so I did the same. Here's what i ended up buying:

http://www.amazon.com/gp/product/B00FHMAIHQ/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1

10 Pcs Stainless Steel 200x3mm Transmission Round Rod for RC Airplane
by Amico