I was thinking about this question today as someone used our work printer for some personal stuff.
As for me, I am printing little things that I would say make it worth it. I’ve printed lens adapters for my camera for example. That’s worth a good 14 to 30 bucks per print. My most favorite photo was with an adapted lens that came from a projector. I also printed IEMs and those things are worth it. Listening to music is second to none on those things. Plus I printed the same shell but for ear protection and again the fit is perfect and sure there’s post processing to get smooth surfaces but in the end it looks like a professional made it. So I think 3d printers are worth it.
Define “worth it”??
For many, it’s a hobby. For many more, it’s an adjunct to whatever hobby they do have. Hobby’s don’t have to save you money; and I’m militantly opposed to monetizing hobbies as a way to “justify” them.
Personally, I’m mostly 3d printing custom components (that I’ve designed), for R/C aircraft of various sorts. (Like, my cyclogyros, or the flying saucer powered by a 3d printed ducted fan; which is, more or less, a scaled model of the saucer from the OG Day The Earth Stood Still. or the thermal airship using toaster wire that has taken on a lot of different forms, ranging from 20’ star destroyers to whale sharks to a robot named Buoyant Bob that hands out candy on Halloween.)
I also enjoy 3d printing as a hobby, in of itself, too. (and spend waaayyyyy too much tinkering on the printer. its fun.) But it doesn’t have to save me money, and I feel no need to compare it to other forms of hobbies. It’s what I enjoy.
edit: lets put this in perspective. This would be like asking a golfer if they found golf worth it. the only real questions are “Do I enjoy it” and “can I afford it”. not “can it save me a buck”.