Teaching how evolution works.
3D printers are a safe way to introduce bits to atoms paradigm shift. Long before desktop nanotech fabrication systems arrive with all the potential dangers they entail, getting society used to the idea of just how much can be done will do more than any amount of one to many teaching seminars of lectures. Open a 3D printing shop in your neighborhood. Offer the services for a nominal fee. Offer assistance to anyone want to make their own 3d Printer. It won't completely decentralize manufacturing, but it will get people thinking in the right direction.
Hopefully by the time mature nanotech is available to our 3dPrinters the memes of perfect recycling and a world not based on scarcity but who can make the winning designs will be etched in our brains.
fixing what's broken
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