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I think that there is one small niche market where it may be possible to make a 3D printer in limited quantities and make a small profit. This is the kit market intended for those interested in learning about 3D printers in depth by building their own printer. This has been tried before: There was for example a magazine series (over 52?? weeks) which would get you a basic printer but it was targeted at fathers who thought their children were geniuses. I think a lack of interest from the intended audience (the children) killed it off after about 5 weeks.
If that printer had been targeted at those who go to Maker Fairs, Hacker Spaces and similar dens of geekdom you may stand a chance. The instructions would have to be clear and copious as well as unambiguous - the writer would have to know the printer kit in great detail and the FFF printer filed in even more detail.
It is unlikely that any regular denizen of these fora would be in the market for such a kit, but many of the same denizens may know people who would be willing to pay just a little over the odds to learn by immersion. Think of your target market as those who would rather learn micro-controllers by getting an Arduino or how to fly by learning in a Piper J3 Cub or how to drive a racing car by starting in a Go-Cart.

Mike