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Hobby CNC
You can get a little table top router and some simple software for a couple hundred bucks. You can go deep into it. Building a custom machine, writing your own post processor, dialing in you CNC to insane levels of accuracy and precision, adding a 4th axis, engineering parts and projects, it goes on. It basically combines robotics, design engineering, and manufacturing engineering all in one hobby.
4th axis? X, Y, & Z with rotation along one of the axis?
Or are you milling time cubes?
5D milling is where it's at. No, it's not a joke.
To piggyback off this, hobby machining in general. You can buy a small lathe pretty cheap but add some decent tooling and oh you need a very fancy tool you don't have? Hand over more cash. You want to make a part that won't fit in your small beginner lathe? Time to fork out for a bigger more expensive one. Oh a mill would be better for that part? Those kidneys could get a basic mill. Oh you need more fancy tooling for the mill now...
Sorry what's CNC?