Knurling Bolt-Nut Connector
thingiverse
Remix of Knurling bolt and nut by <a href="https://www.thingiverse.com/akira3dp0/about">akira3dp0</a> https://www.thingiverse.com/thing:1460364 This part can screw into copies of itself. I've also included a version with a hole through the center.
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