Kegan Schouwenburg's advice to entrepreneurs working in 3D printing, from an interview with Ideas Lab:

Do something that isn’t being done currently. There are so many unsolved problems in 3D printing, and it seems like everybody is focusing on the same one right now, which is basically: Let’s make a cheaper 3D printer. But that problem has been solved. We have that. I think the question now becomes, How do we create products that people want? How do we develop the infrastructure to support that?