Hi all! The OpenForge Sewer collection by @devonjones looked like a lot of fun to paint, and @Poxos has a great OpenForge 2.0 version of the walls and shallow sluices, but I wasn't able to find a 2.0 compatible version of the deep sluices, so I pulled them into Blender and reformatted them a bit to fit better. I also included @Sancharizard's straight sluice transition so that I could get them all to be more or less flush.

In order to fit in the vertical space but preserve the detail on the stonework, the bottoms get pretty thin. I printed these with 0.1mm layers in normal PLA and there's enough give that they never felt at real risk of breaking. Using 0.1 gets 2–3 layers crosshatched over each other, which helps. The cross is definitely the worst, and everything else has enough structure to hold fairly stiff.

Anycubic

Kobra 2

No

No

0.1mm

15%

I started with @devonjones's OpenForge Tutorials Sewers Guide, but I started with a stone gray plus a black wash, instead of a black base and drybrushed gray. (I haven't added any gloss/water effect finish yet in these photos.)

For the deep sluices, I did a dark brown (GW's Rhinox Hide) around the edges, black in the center, and then progressive black glazes that got wider and wider to get the gradient.

This is not clever, it's based on a very basic understanding of Blender.

I imported the STLs—along with the shallow sluice tile and a 2x2 cut stone floor tile for reference—and then ran each one through the same process, starting with the transition:

1. Z-axis scale and move until things lined up (For the transition tile, I focused on getting the curve of the shallow side to match. Then I used the raised walls of the transition tile as my basis of comparison for the rest.)
2. Use and apply a boolean "difference" modifier with a "max depth" cube I created and lined up with the base of the 2.0-style tiles. This ensured the bottoms wouldn't go too far down.
3. Use and apply a boolean "union" modifier with a "minimum floor thickness" cube, which makes the water surfaces a tiny bit shallower in exchange for a couple extra 0.1mms of thickness.
4. Re-export the new STL.