I have to say... It is absolutely fantastic to hold in your hands an object made from 3D artwork that you've created
I am currently creating 3D artwork for a Victorian Railways freight wagon kit in HO scale to rapid prototype (3D print). We're having them done by a company in Melbourne (well, a little out of Melbourne, but hey!), so a bit less expensive than buying your own (and better resolution IMO). The prints will become masters for resin casting.
If there's interest, I'm happy to see if I can grab a set of the current samples, and post some pics (including the artwork).
I will say this, it can become fairly costly to do, and you do need some experience with 3D creation (using appropriate programs, 3DSMax isn't really the best, but it certainly works!). Cost comes in when you have to do a few samples!
It really is a wonderful feeling to hold the 'real' printed object in your hand though, after all the work on the computer. It's also a great way to produce somewhat less common subjects for model railways

Zec