Remixed:
https://www.thingiverse.com/thing:4801185

This is a remix of the "pillbox" (basically just a hollow, tall 7-hex piece frame) that comes with the cavern. Just voided out one side.

Then you can stack the cavern on the cavern base and have a tall cave for a troll or dragon of your choice.

I had to print with brim on my Creality Ender 3 v2 to avoid slipping.