Lol 3D printing is the nr. 1 hobby on Wikipedia! I can agree with nr. 2 and 3 as well, have yet to try nr. 4, possibly 3D printed, although I do have a native Polynesian boomerang.

I do agree that 3D printing is a hobby just like sawing, we can get a bit obsessed with the tools themselves. But figure sawing is definitely a proper hobby as well - anything you can put your heart and creativity in. Hobby relates to passion - what you love and what you are good at - in the end we also want to make something useful to the world and gain wealth. I haven't heard any news about Jay Leno and that Arab sheikh though.