My guess is the best market for space-manufactured objects is in space, particularly for objects which take advantage of the unique space environment, say, l

My guess is the best market for space-manufactured objects is in space, particularly for objects which take advantage of the unique space environment, say, large solar sails or solar collectors. 1 and 2 were hyped up for the Space Shuttle in the 1990s and you know how that went. 3 is newer but all the time I read stuff on "why biological systems don't work quite right in zero gravity" so it might be more like space travelers will want to go to Earth or spin things like an O'Neill colony to do those things than the other way around. From the viewpoint of "get some numbers to run that can show it makes money" I like "new patents on blockbusters" but I'm skeptical that people on Earth won't find equivalent methods of manufacturing or that politicians will let you make those profits.