These are walls and ceilings compatible with the Into the Dark terrain for Kill Team 2022 by Games Workshop. They are not a replacement for the existing ones (no model has a door i.e.), but to expand existing terrain, have windows (on the height of barricades) or use it in other games. There is also a ceiling piece so that the Into the Dark terrain can be used as a bunker i.e. to play Space Station Zero.
You need four “Wall Pillar Plugs” and one “Wall pillar” per double wall and all objects can be printed without supports.
A great addition for those walls are the Sci-Fi consoles from Knarb Makes:
https://knarbmakes.com/listing/sci-fi-consoles?product=953
Note: I will design a standalone pillar so that the ceilings can be supported. This model will be added here when it's done.
The author hasn't provided the model origin yet.