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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2 questions:

Why resort to a machined bolt with much reduced surface area contacting the ABS (or alt material) as opposed to a larger dia design, ie. MK5 drive gear?

If the bolt is used as described, what is the source - readily available?

Absolutely thrilled with my BOT but always open to improvements! Particularly interested in ABS feed reliability.