Neat! I love the chains, I think it's awesome that you can print that kind of thing.
And yeah, It's technically the shoulders, the elbows, and the wrists. And I think I need to reconsider my whole method for attaching the hands. Even so, I'm still tempted to try to do them traditionally... I think the problem is that although I'd sculpted the legs in wax, so I knew they'd work, I hadn't done the arms when I switched to digital. It's just harder to figure out if things are going to work when you can't play with them.
I've actually never printed WSF... I used some nylon parts when I was making joints IRL, and I found it was a huge pain to cut and sand.. a little too strong & flexible, if you see what I mean. So I assumed printed nylon would be similar... my choice of 'cheap' material has been sandstone, but obviously it's a lot more fragile -- no tiny chains, for sure. But if you're ever making something bigger, you might give it a try.