The figurines might have to be official and "proper" for tournament play.
But terrain is more vague. Though still dimensionally specified.
And I always feel that it is a shame that so much effort is made to paint armies near perfectly and yet the terrain is flat felt green, or matte grey painted chipboard, with some stuff chucked on it...
A 3D printer can make hills, ruins, furniture, burnt out vehicles - all the other cruft of a gaming universe to give it life!
You can even print rather large terrain pieces that use a smattering of filament. Low percentage lightning until and 2 walls, and you can basically spit out blobs as big as your printer can handle without much waste
