While making Lifeburns Dungeon Tiles compatible to Openforge 2.0 I decided to design some sort of passage/hole in a cavern Wall Tile. I was able to print one of those without supports, nevertheless I would recommend it. Just use those tiles with any openforge 2.0 bases (2x2)!
I also remixed Lifeburn's Basic Cavern Tiles https://www.thingiverse.com/thing:3516425 the River Tiles https://www.thingiverse.com/thing:3517355 and the Graveyard Tiles https://www.thingiverse.com/thing:3518744 to make them Openforge 2.0 compatible, so check that out too!
All the credits go directly to Lifeburn for designing those awesome tiles! I just edited them a littlebit, because I liked them very much and wanted to use them on my game table alongside my other openforge 2.0 tiles.