Here some of my favoriets:
(Note: The title is “extremely clever” not “I want to boost my 3 minute design that cost me 8 days”)
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Well somehow it also fits into here. The link for the conversion kit on aliexpress is right in the YouTube video description (I don’t know if it works, but it’s definitely clever):
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Self printing robot snake
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Well, that’s probably a league of its own…
This one is ambitious, one might say overly ambitious or perhaps too idealistic, but it’s very much aligned with the original rep-rap goal of self-replicating printers. And that original rep-rap is, of course, the origin that evolved into what we have today:
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His idea with the negative angle in the threads is pretty impressive. 