[jokermatt999]

You may want to look more into communes (https://en.wikipedia.org/wiki/Commune) to see what does and does not work about this arrangement. Unfortunately, most of these examples are going to be skewed because of the selection factor (what causes a group of people to recuse themselves from wider society? Radical politics, religion, or often just cults), but there's still something to be learned there.

While technology makes a self-sustaining community require less human labor for food, water, shelter, etc, there's still the issue of technical maintenance. 3d printer filament, machines parts and repair labor aren't free.

For another perspective, you could also look into the Seasteading movement. I can't say I'm too well versed in this field beyond a passing interest, but I think there should be quite a bit of information on the logistics of it. The governance (or lack thereof) would be the interesting part.