single chain link
thingiverse
Customized version of http://www.thingiverse.com/thing:28405 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=28405 Instructions Using the following options: Tolerance set at 3.5 millimeters. Dia set at 12 millimeters. Length set at 22 millimeters. Ring outer radius set at 20 millimeters. Pitch set at 12 threads per inch. Links set to a single connection. Type specified as a straight pipe joint.
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