@Bruce Brown posted:...While most of us will never own a 3D printer...
You might be surprised at the cost of 3D Printers these days. Like all emerging technology, the cost has come down substantially. HERE is a page of 3D printers, priced from $189 to almost $13,000. 3D printers in the $300 to $600 price range will work fine for making nicely detailed O scale items.
This link to the 3d Printers page comes from the 3D Printing 101 page in the OGR 3D Catalog site.