But things cannot be created from nothing. Energy and elements would be necessary to make the required molecules. I think Snowcrash by Neal Stephenson had a cool 'replicator' technology. As I recall, there was a 'pipe' that delivered the elements to your house and then your home device put them together into whatever you wanted. Basically there was an Element Service Provider. Wealthy people had a fat pipe, so they received many elements quickly and could make things very fast. Poor people could only afford a small pipe, consequently their items might take weeks or months to make.