Ooh.  Looking at the image of the chain link, above, I notice that I still need to do some work on setting the proper angle for each circular cross-section of the loop.  Seen from above like that, it's clear that the angles are pretty close to correct, but not really.

I'll see what I can do about that....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.