Here is a set of Stalagmite scatter terrain for your tabletop RPG games. There are a few different configurations of them, so hopefully you will find the one that fits your game. All the models print flat and do not require rafts or supports. All of the models are fully scale-able so you cant print the size you need.
The two Stalagmite Ring files have a recessed center so you can pour in clear two-part epoxy resin to create a pool in the center. Alternatively, you could forgo the epoxy and just paint it to look like water, stone, or lava.
This is a remix of Lifeburn's awesome Cavern Stalagmite Floor Tile.
If you are interested in more cavern scatter terrain stl files that you can pour epoxy resin into to create pools, please check out https://www.mystic-realm.com/ They have a fantastic collection of beautiful models for your cavern adventures.