I think this is a great idea. My son keeps pushing to make more use of the 3D printer that I have. I originally bought it so that I could recreate draw slides that weren't available for an old metal desk that I use for my train workbench. Luckily my daughter, who is an engineer, is quite adept at using CAD software to design the slides that I needed.
My son is 26 and living back home since he changed jobs and this location is 40 miles closer to the new job. While he is here he is helping me with building a pretty large layout. He has the train bug and is probably one of the few that will keep the hobby going. He just joined the TCA.
In the meantime, I think he would love to get the 3D printer re-set up and start printing things for use on the layout. I was telling him about the escalator that Alan built and he was very interested in building something like that.
Let us know if you need any help in setting up the files, etc.