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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Thanks - I ended up using M4 bolts and nuts, so I can confirm that those work well. Thanks again for the awesome design, it's modular setup made it very easy to customize to my setup by just leaving out an arm section :)