It is not on top of the hype wave (anymore), and “it won’t make you millions instantly”, but robotization alongside customization and localization discussed above are the manufacturing trends of the future.
And 3d printing combines all of those. You do the math.
Besides market size and trends, there are a few equally (if not more) important things I consider, when I think about starting something new. So
3D printing (or anything else) is a good startup, if:As a bonus, the competition would probably be lower, compared to other “niches” since not so many people like to get their hands dirty, and there is no “instant gratification”.
So if you like it, are not afraid of work, and don’t expect to wake up rich instantly - there is a high chance for 3d printing to be a good startup for you.