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Making something requires precision, and making something smaller requires more precision. Your hypothetical requires that we make something that in turn makes something else with even greater precision than we ourselves are capable of.

Also… computer chips are small, but the process to make them cannot be replicated by some miniature robot.

That makes sense, I always thought a robot could be far more precise than a human but I think obviously things are more complicated than that.

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The robot might be, but the human has to verify it. How do you confirm that it’s accurate/precise aside from having a person check it? The robot will do exactly as it’s told, but that doesn’t mean it’s right, just that it’s obedient.

Not everything scale that simply.

Let's go for one very simple issue: Chips. Chips can only be made so small for physics reason. We're currently making chips and motherboard so small we can't make them smaller and still have them function reliably. We're talking nano meter wide circuitry. You can almost count the wideness in terms of molecule. A single grain of dust can already cause malfunction in these kind of things.

Nanomachines (son) are still really far away from being an effective solution. And that's not talking about batteries autonomy on these things.