I knew a guy who found an interesting 3d printing niche: 2 way radios for professionals (mainly SAR crews) are always getting fetched up on clothing, and you're often finding the radio turned off because the knobs got moved. Dumb problem, should have been solved by fundamental engineering years ago - but whatever. He built a 3d printed shroud for a variety of popular radios, and now makes a living selling these.

He's a tech guy, but no engineer. He saw the need (he works on a SAR team), saw the solution and made it happen. Inspiring, really.

I do a bit of 3d printing stuff myself. Personally, I'm attracted that it's getting more professional. I can use it as the impetus to learn real engineering/CAD, etc. Not in an "I'm an engineer" way, but still using real principles to make better things. You don't have to be intimidated if you keep your identity small and let it inspire you instead.