I've done quite a bit on CNC and manual machine tools, been priveledged to work on some real dandy projects. That being said, except for some very unique contracts my employers were able to obtain, most of the job is loading parts and pushing buttons. I've done quite a bit on the small manual machines, which I enjoy due to the challenge of set-up and not having access to the latest whiz-bang tooling. People will tell you they are inaccurate and incapable sub-par machine tools. To me these are very similar to the statements from shooters that feel they need a $5k rifle to hit a target a few hundred yards away, anything less turns them into an excuse factory. A friend that just completed the local CC's CNC program and I were talking about the 3D printers. For lack of a better analogy, the latest iterations basically squish out a hot polymer compound (sort of like a hot glue gun) over and over and over until it builds the part you need. They are pretty cool to watch, if you can find a video of it building something. Nevermind...
Pretty intricate stuff! Probably won't be long before they have one that will squish out molten metal in any shape/form you want. Jon