My son's gave me a 3d printer for Christmas last year Since that time, I have printed 1 item...just to see what it can do and the possibilities are endless. My lack of doing anything further is the absence of files that I want or am willing to pay for. I did run across one forum member that had done some great things and I asked if I may purchase files so I could build. That was met with a stern rebuke and a pretty lousy attitude so I just forgot about it. Due to the lack of files, I considered getting a 3D camera to make my own files...again, not a motivating proposition.
I will say this, I would gladly consider paying a membership to this site to have access to files without having to worry about royalties or copyright violations. Additionally, how many of the items we would want to print would be in competition with Forum sponsors? People, fences, scenic details, out of production engine and/or rolling stock pieces?
Standardization of file formats is another consideration.
I look forward to joining and subscribing for this purpose.