[sejje]

Do we have anything that self-replicates physically?

Software, sure. I know 3D printer folks will sometimes 3D print parts for new machines. But nothing that fully replicates itself, right? Especially autonomously.

Maybe we'll see what a moon base can bring us.

[diziet]

Basically all of life is self replicating, physically.

[psychoslave]

I guess the OP meant something that is more flatous for human vanity to feel like a demiurge when at most it would be a tool of cosmos in its experiment.

[GTP]

Yes, but this isn't what the paper is talking about.

[GTP]

Additionally, you also have to consider that a self-replicating space probe should be able to find, retrieve, and process the raw materials needed to build new probes on its own. A 3D printer can print some of its own parts, but with externally-provided material that it isn't able to produce on its own.