You can practice for "the future" by learning to build your own 3D-printable models in your computer.
If you manage to get good at it but still can't quite swing a good enough printer, there are businesses who have made the investment in high-end printers who can print your design files for you (Shapeways, for example)
If I were to explore that tactic, I'd look at making some O-scale passenger car seats that could be reproduced with rubber molds so I could inexpensively turn out a few hundred copies to outfit the passenger cars I have from the "silhouette strip" era. (and then sell additional copies to folks who chose not to take the initiative 
)
---PCJ
