Could Greys really be made by self-replicating probes?

It works as a speculative story, but there are several separate claims packed into it: that probes exist, that they can manufacture biological-looking beings, and that those beings pilot craft. Making one step imaginable does not establish the others.

“Three-dimensional printed” may also be a loose analogy rather than a demonstrated process. Without verifiable physical evidence or reliable data, the idea stays an interesting possibility, not an explanation we can confirm.

The useful question is what the theory predicts that competing explanations do not. For example, could investigators identify repeatable manufacturing traces, unusual materials, or consistent design features in independently verified specimens? Those would need careful testing and a clear chain of custody.

If every possible finding can be explained away as probe technology, the claim is hard to test. A specific prediction that could turn out wrong would make it much more assessable.

Possible in the broadest sense, sure. But possibility is a very low bar. A compelling link between manufactured beings and probes would need more than the two ideas fitting together neatly.

Reports or unusual-looking remains, on their own, cannot tell us how something was made or what it was used for. I’d keep the probe explanation in the speculation column unless evidence can rule out simpler alternatives.