Mini-factories - What am I going to do?

My father was (and still is) an entrepreneur.

But I am more influenced by the conveyor-belt educational system, and have been, for the last ten years, an employee of a Fortune 500 company. I am well-compensated, but I don't get a sense of mission or purpose from what I do. I do a good job, and provide value to my employer, and there are occasional moments of satisfaction in a job well-done, or in an interesting problem solved. But I have a deep desire to believe that each day's activity is focused in some way on the world's large-scale problems that need solved. And I think that is best done in a mini-factory, rather than a mega-factory.

So what is the mini-factory that I am supposed to build?