This was a commission from a player of a game called Kingdom Death. The game features high quality resin miniatures. Unhappy that all of the terrain pieces were just cardboard, The client selected several examples from the game and gave me dimensions and directions of what he wanted to create his custom Kingdom Death game. All of the .STL files were designed to print on his Form 2 SLA 3D printer.
If you are wanting to 3dprint your own set, I have updated the designs a bit (adding some vines and weathering and other details):
You can buy a set of the updated STL files on Cults3D