AI, automation, etc. won't create unemployment. they will change what employment is available on the market, but the economy has been experiencing that since at least the industrial revolution, and the result has been higher wealth production. 3D printing is more hype than practical micro-manufacturing, but it has the potential to decentralize the economy, and that is a good thing.
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Oh, I may of course be proven wrong by events, but I think this time is different may finally be the case.
I wouldn’t be so sure about that. HP is rolling out 3D printers that can print steel.
Sintered metal is a decent option for many applications, but it has been widespread in industry for ages. Cutting the cost for the home user is great, but I still don't see it as the end of the manufacturing industry.