This is a replacement Heroscape Rock Outcrop tile from the Battle for the Underdark Master Set.
It was sourced from the [Heroscapers Index of 3D Printed Stl Files](https://www.heroscapers.com/community/showthread.php?t=52903) and republished here for posterity.
I recommend multiplying the model in your favorite slicer and printing 3 of them at once to complete the set included with Battle for the Underdark. You can even print up to 6 if you're interested in recreating [tournament maps](https://www.heroscapers.com/community/showthread.php?t=5725&page=3) such as the ones used in GenCon.