Thanks!
I would have liked to become a prosthetist. It's at the intersection of machining, modelling, technical problem-solving, electronics, biology, medicine and social work. It's more often than not at the cutting edge of technology and prosthetists get to help real people with real problems.
But my professional life took different turns, and now I'm close enough to the end of it that wouldn't make any sense for me to switch career again. Particularly considering the degrees and the years needed to become a certified prosthetist.