What if robots start self-replicating using 3D printing?

They won't,, indeed can't, do that alone.

Whilst it's perfectly possible to use 3D printing for [i]some [/i]of the components (others, and of course the printing materials, would need be bought from elsewhere) , both the machines and products have to be designed and set into operation by people.

Ultimately the so-called "robots" are only machine-tools.

https://en.m.wikipedia.org/wiki/Gray_goo

Good, maybe they can fix the supply chain shortage...then they'll eat us...

Can't you print a 3D printer with a 3D printer?

The guy robots will only put in a huge hard drive and send pics of it