If you can get contract jobs for aerospace, petroleum etc. then yes. For example, short order prototyping in aerospace and repairs in petroleum. Kind of like getting a programming related job, it takes some networking and reputation. Custom work for cars/motorcycles can also be good with networking and reputation. Other than that, it's basically being the cheap mechanic that can fabricate new parts instead of buying them. Which is not good in the good-vs-evil sense, but not so lucrative.