3d printed tanks

I like to keep an war to the ground in 1940 war games and one thing that is revolutionizing the hippy is 3d printed models. I don't know much about the process but scale is not a problem as once rendered they can be easily increased or reduced in size. https://www.otpterrain.com/collections/tanks-artillery?page=3
Files for World war one tanks  can be downloaded from here
https://www.thingiverse.com/thing:3555618