I visited a friend who has a 3D printer. He offered to demonstrate me how it works, and told me to think of something to print.
As 3D printing takes a lot of time(sometimes hours) when you have complex shapes, I figured out fast what to print:
It's 4cm in diamater and took 20 minutes.
Me want 3D printer. :3
That being said, for small, cheap, one-off components they are pretty useful. As an example within the next few weeks I'm going to have to get some parts printed which will be used in a model aircraft.
I'm going to have to get test pieces printed off next week to see what glues are the best as well.