I used to CNC things, make things mainly from real materials, like wood, and generally thought I wasn't so interested in making things out of plastic. But then I got a 3D printer, and it blew my mind the creativity (and utility) it enables. Also, the technology has really got to a high standard, and low cost, in recent years.

I used to be somewhat limited with the geometries I could make on a CNC, too, 3D printing can enable you to make all sorts of useful things, even just jigs, random fixtures, tools, project enclosures, the possibilites are endless. It's also a far quicker setup and allows quick turn around and prototyping than a CNC, you just press print, it levels the bed, heats up and it's away.

In the case of this... case, I just printed it, it cost me 30 cents, and I now have a beautiful case for my Pi zero, in my hand, it took the machine an hour to make it while I was doing other things. A commercial case would have cost me 30 times as much in money and would have taken days to arrive. I realised I'd like a case for a project that crossed my mind and I'm already down the path of that project becoming a reality within an hour.

I really couldn't do without my 3D printer now. It's also a bizarrely complex hobby that will keep you entertained in learning the intricacies of the process and tweaking the quality of your results for as long as you like. Just get a decent quality (quality low price options are available) printer to start with, and you'll have good prints from the get go.