I actually would LOVE to learn how to design stuff for 3D printing (need to buy my printer too though, maybe when STEEM prices go up?) - and have NO idea where to start. But it's the future, indeed, I see huge advantages from fashion (like, real 'made to fit clothing instead of the ridiculous fashion shapes we all have to conform too!) and housing. It's kind of amazing.
Enjoy your learning process, and if you have tips on where to start less general than 'Youtube' I'd love to hear it :-)