Not my area of expertise but you might be able to CNC the lens.

(Part 2: Goes into math) https://www.youtube.com/watch?v=ADtw6cxEK28

(Part 1: Shows CNCing / usage) https://www.youtube.com/watch?v=ZW2lj0KjyT8

Super cool project, and they did a really great job documenting the process.

That said, a hobbyist level CNC will not be able to make a functional lens. Tolerances are way too high. Maybe it'll be good enough for focusing light and burning holes in paper, but it's not going to be remotely close to photography level.

So is this one here, no? Both projects seem to assume that the glass itself is a given.

But here the aperture and focus is also 3d printed

Matt also did the part about focus (between the projector lens and the fresnel lenses) but ok, I guess it is an important distinction that you made.