I fully agree with this. I started designing from scratch a firepower alike pinball. But instead of trying to order all the parts, I design them and print them with a 3d printer. It is so satisfying to design your own parts - e.g. a flipper or bumper - print it out and see it working! Priceless! Possible I went bit over the top, and even would make my own coils and plungers.. But it all for fun.

Another aspect for hobbies for is, that you learn so much by doing it yourself. New technics, new approaches, new idea's.