This a bolt I printed on a Robo 3d R1. It threaded well with the accompanying nut I printed.
Here is the album of things I done printed so far (including nut on bolt action!):
https://imgur.com/a/MvmFu
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Junot Díaz visits Google’s Mountain View, CA, headquarters to discuss his novel “The Brief Wondrous Life of Oscar Wao.” This event took place September 26, 2007, as part of the Authors@Google Series.