I purchased two 3D printed ruins from QP3D Wargames. One of these was The Ruined Steele Residence.
They are 3D printed models. I bought the 15mm versions to use with Flames of War, but you can buy bigger versions for other gaming systems.
The model comes as two printed parts.
As you might expect with 3D printer models there was no flash and the parts fitted together easily. Though I have left them separate for the moment for painting. Looking closely at the model, especially on the sloped areas, you can see the 3D printing plastic layers, but only if you look really closely. I suspect though that dry brushing the models may emphasise these layers.
The first stage will be to prime the models with a white undercoat.