I've been 3D printing like a bandit for an upcoming con. Though, im hosting a 40 person tournament so its a lot. There is quite a bit of files online for this kind of thing. I just recently backed C.O.R.E. which is a series of spaceships and stations which I think would be great stages for a con game one shot.
Is 3D printing right for you? It has some up front costs. Right now Bambu has a great sale on the A1 printer with an AMS (machine that allows you to print up to 4 colors or more) for $380. Once you have a printer, a spoil of filament is about 15-20 dollars and prints a good amount but hard to say exactly without knowing what you are printing. Alternatively, there are resin printers for about the same cost, but the matieral is toxic and needs a good workspace. The detail of resin is unparalleled though. My rule of thumb is if you are printing lots of miniature figures, than go resin, if you are printing lots of terrain, go filament.
Resin set up
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Filament set up
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Examples of prints I have made.
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This example shows you what an "AMS" can do. All the color is filament I did not have to paint this at all.
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