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I have doubts. 3D printers are effective at replacing casting and (sometimes) stamping. But they don't replace forging, rolling or assembly of moving parts. That is, I think they most replace manufacturing operations which were low labor anyhow. I doubt they'd actually reduce labor in those areas, since the number of people needed for them seems to be one already.

If I was looking for an industry to be hit hard by 3D printing technology, I would look at companies which specialize in tooling or warehousing specialized single component parts.

I always have the same dream since childhood. however the cloner machines could be sold to everyone. and we could copy all manufactured goods to friends.