Hi, Fat Dragon Games is a company that was producing fantasy 3-D stuff for a long time - walls, doors, and they even have a few low-priced 3-D prices listed to help produce these very thin plastic pieces. The stuff looks great and with only the major investment of about $400 for a printer, you have an endless supply of dungeons and settings for fantasy RPGs.
Today they announced the release of World War Telsa game with numerous tanks, armored cars, and lots of other figures in 15 mm scale. The vehicles look great!! They'd fit perfectly into our AQMF world as they're based on WW1 designs. I suggest a look at their site. I'm busy trying to get funds together over the next few months for a hopeful purchase of a low-end 3-D printer for my b-day (31 Mar). First, I've got some buys for my AQ game from IG and others so we'll see.
I have a set of their outdoor terrain. They have some really nice trees. The trees are both attractive but also robust enough to stand on the table well. Not well publicized: they have a platform in the tree canopy where some elements can stand.
I believe Fat Dragon actually has a couple of listings for cheap 3-D printers - that's where I got the suggested price. As you're probably doing only the FD stuff, which is thin, this cheaper version would work well. If you plan on going the Shapeway route of full metals and plastics, I'd recommend a much more expensive machine - I've not researched those as they're way out of my price range.