There are some very cool releases for Adeptus Titanicus today, but one nice addition for your with 3D printers out there is GrimDark Terrain making terrain that fits perfectly for your AT games.
While GrimDark Terrain does not go through Patreon, they have their own subscription service where you can get monthly stl files for your 6-8mm games. You can also just pick up the sets you want! So its a win win scenario.
The guys at GrimDark did comp me a March/April membership so that I could download and print out a set of what they have to offer (which we will be seeing some of later this month).
Here is an example of what they offer for March and April.
Ive just started going through some of these files and they look very detailed. These will be fun to print up.