P.S. we use oxen power in my community. It's terribly slow and demanding if you're trying to raise more food than for a large family. Few families will make the necessary sacrifices to actually eschew power equipment.
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Nor should we eschew more practical means of generating power--as long as we don't have to.
Oxen, as you point out, aren't particularly efficient engines. I've been wracking my brain for decades to devise a means of making chickens haul their own tractors. Not easy.
Stationary bikes are probably more efficient than oxen, but there's plenty of better ways to make power, and if Megacorp won't play nice, then bye bye Megacorp!
Power is available in so many different forms that it's really not possible to prevent folks from generating it.
Just ran into a tidbit about management software for composite printing (this is both control software and higher-level apps) with organic and inorganic fibers, presumably some tweaking for metal (nano-wire, whisker, and cermet fiber) is possible.
http://3d.markforged.com/try-eiger.html
It's not locked to the company's multi-material printers.