Re: How hard is it to acquire raw materials for 3D printing?
More or less, though actually, I only ran one of those campaigns. (I played the vacuum cleaners' ships AI.) Frankly, the 3D printing stuff is an aspect of the setting I don't tend to get into much when I'm designing campaigns or scenarios; whatever's going on, whether or not it matches the main book text, it evidently supports and works within the society as described in the books generally, and provides a handwave explanation of how thin-spread outer system societies survive, and as a GM, that's all I really care about. 3D printers are like delivery trucks or gravel pits in a modern-day game; they exist, but PCs don't get to do much with them, because that'd just be Adventures in Basket-Weaving.
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