Whats a hobby/craft that you wouldn't expect that has an incredibly high ceiling either monetarily or in sheer skill?
For example, I'm sure the average joe doesn't know just how expensive calligraphy pens can be, or how deep the rabbit hole goes on video game speedruns.
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4th axis? X, Y, & Z with rotation along one of the axis?
Or are you milling time cubes?
Yes, rotation. It'll allow you to do diagonals instead of just straight down. Although milling time cubes sounds awesome
5D milling is where it's at. No, it's not a joke.