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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website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.