>Something tells me that manually fabricating it on a small lathe/mill like Lonnie Johnson did would be much faster for prototyping than 3D printing, even today

>Something tells me that manually fabricating it on a small lathe/mill like Lonnie Johnson did would be much faster for prototyping than 3D printing, even today ... but I could be wrong. I think you are correct, and this is true for many designs. Widepsread love for 3D printing doesn't change that. When all you have is a hammer etc.