A gentleman by the name of Cody Wilson who owns a company named Defense Distributed, that also created the liberator 3D printed pistol, has designed and manufactured a mini-CNC to finish 80% lowers. They sold out quickly.
https://www.youtube.com/watch?v=xwRtll3jjU4
https://ghostgunner.net/
https://defdist.org/
That $1,200 Machine for Making Untraceable Guns Just Sold Out in 36 Hours | WIRED
https://www.youtube.com/watch?v=xwRtll3jjU4
https://ghostgunner.net/
https://defdist.org/
That $1,200 Machine for Making Untraceable Guns Just Sold Out in 36 Hours | WIRED