I don't (yet) have a 3D printer myself, but have been looking into the costs for when I get one.
The Fat Dragon dungeon terrain stuff works out at just under a dollar to print a 2x2 section of dungeon flooring including a 2x2 wall along one side.
The 3D village stuff is much larger, so will cost more, but I suspect it will be considerably less than the equivalent resin pieces, and the latest stretch goal unlocks detailed interiors if you want them.
Third party 3D printing is of course more expensive, i am looking at local providers at the moment to see about getting some stuff done. i will report back when I have something.
Of course, it would be cheaper still to scratch build them, but not everyone has the time.