scatter terrain

So far, they have had a kickstarter that features a Vauban Fortress Files.

From Kickstarter:
For 16 years, I have been producing scenery, terrains and buildings for tabletop games and models in my company www.Esloterrain.com. The production takes place on CNC milling machines and laser machines and for a year also on 3D printers. More than 700 products have already been designed by me.

Imperial Terrain makes awesome terrain for Star Wars Legion. Their tagline is Imperial Terrain - "Terrain for your Galactic Civil War". This is the best site to find purely Star Wars Legion or Imperial Assault terrain. It also works for other Sci-Fi games as well. Many designs would work for Tau armies. If you don't own a printer, he also prints and ships pieces.

Maker of 3D Printable Terrain and Miniatures. He has models from WWII to Sci-Fi.

Maker of scatter terrain for fantasy games, though some would work for modern caves/sewers as well. Check out their YouTube channel for videos on prepping and painting their files. (These videos would work for any natural terrain like this)

Maker of a wide assortment of 3D models for fantasy games.

Maker of sci-fi terrain for all kinds of games like Star Wars Legion, Kill Team, Necromunda, Infinity and more.

Designer of fantasy terrain and Blood Bowl pitches. Also sells resin casts. Amazingly detailed models that look amazing on the table.