I always liked the Sewer Tiles by @devonjones but unfortunately I couldn't find any openforge 2.0 compatible versions. So I decided to go ahead and do the same thing I did with @Lifeburn 's Cavern Tiles and adapt them to be 2.0 compatible.
These work with any openforge bases (2x2). As aIways, I concentrate only on systems that work with 2x2 Tiles, because in my opinion these give you enough options on building any dungeon you want, and also keeps it simple! For Floor Tiles just use the Openforge 2.0 Cut Stone Floor Tiles by devonjones : https://www.thingiverse.com/thing:1422779
Be aware that the "Sluice" was rather tricky to adapt, because of the "depth" that comes with the tile. As a result of making them 2.0 compatible they get quite thin around the deepest point of the sluice in the middle, so work with them very carefully, or you will break them! (Unfortunately, they can't really display more depth, but if you plan to work with some hardening liquids that work to display water or drainwater, you will be able to work around that pretty good and give the illusion of a deep sewer sluice.) In my opinion, for tabletop rpg purposes these work out well enough.
Note that I printed those tiles with .2 layer height and IMO this is the absolute minimum you need to go for here, in order to keep those thin bottoms of the sluice intact.
New Stuff will follow for the Sewers 2.0 but I also contuine to work with new designs for the caverns 2.0. If you have any suggestions of tiles that really need to be openforge 2.0 compatible (preferable some that work with the cavern, graveyard or sewer sets) let me know!
I hope you like it! Also check out my other Adaptations for openforge 2.0:
the cavern tiles https://www.thingiverse.com/thing:3516425
the cavern river tiles https://www.thingiverse.com/thing:3517355
the cavern rivergate and waterfall https://www.thingiverse.com/thing:3549116
the cavern passage https://www.thingiverse.com/thing:3520357
the cavern elevated tiles https://www.thingiverse.com/thing:3523328
the cavern pillars https://www.thingiverse.com/thing:3523505
the cavern staircases https://www.thingiverse.com/thing:3525648
the graveyard tiles https://www.thingiverse.com/thing:3518744