Niche? Are you a lunatic? The 3D printing industry is one of the fastest growing fields in the world. 3D printing is getting cheaper and cheaper compared to eg. CNC machining. The industry is a very important one, because it allows you to create accurate parts much more quickly that to drill a block of metal. And all this not even mentioning that this required mostly general computer science skill, I hope you won’t call the computer science field niche?