I've given some thought to this in a loosely survivalist way, but not with such advanced technology. For example, I can start a fire with a magnifying glass, a lighter, or matches, but if the world goes to shit and I run out of lighter fluid and matches and someone steals or breaks my magnifying glass I want to know how to use a bow drill, too, because heat for cooking and keeping warm is one of those Really Important Things. But to use a bow drill I have to know how to make, at least, a crude knife (stone? waste glass/metal?), and have some sort of string or twine (also something that could conceivably be scavenged from waste matter). To this end I've learned to spin and will experiment soon with making thread out of nettles.
My perspective on this is always fairly post-world-falling-apart so there is garbage that can be scavenged and cobbled together, although it's hard to say what the availability will be.
I think the biggest obstacle to getting very far with technology-from-scratch, even with good garbage scavenging, is that just staying alive takes really rather a lot of effort. Of course if you're alive now and you have advanced technology to make the just staying alive bit easier, you could get really quite a lot done in terms of technology from scratch.
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My perspective on this is always fairly post-world-falling-apart so there is garbage that can be scavenged and cobbled together, although it's hard to say what the availability will be.
I think the biggest obstacle to getting very far with technology-from-scratch, even with good garbage scavenging, is that just staying alive takes really rather a lot of effort. Of course if you're alive now and you have advanced technology to make the just staying alive bit easier, you could get really quite a lot done in terms of technology from scratch.