A bit of a non-sequiter, but I&#x27;ll bite.<p>Replicating toolboxes. Or self-replicating benchtop factories.<p>Microcontrollers could be produced using dip-pen nanolithigraohy, or a few other techniques.<p>Of course we need decent open source atomic force microscopes first.<p>There will always be components that can&#x27;t be produced on that kind of scale. In reprap parlance we call the &quot;vitamins&quot;. An apt metaphor.