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Entry level 3d printers are less than $100 now, so it's as cheap as drills and dremels. Compare to the cheapest decent desktop milling machines at $1000+... which also require an order of magnitude more CAD/production engineering knowledge to use.
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Not to mention also harder to make safe for consumer use... But design for repairability and durability + 3d printers everywhere + strategic use of 3d printable parts with open CAD = unreasonably leveraged resilience increase
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Imagine networks of off the grid container labs all sharing best practise and files from all over the world. Very few problems you couldnt solve with that