3d printed house

Hi everyone. I have a task: to make a house model 1:100. I’ve made projection in Archicad. Is it possible to convert a file into STL format to make a printed (3D) model? I am using a 3d printer for miniatures (like this one). I hope the printer will be able to make this house, but first, I should solve one problem.

If someone was familiar with printing a house model from Archicad answer with your tips or suggestions.
Does the system recognize a model as one solid object? (because in Archicad the house model isn’t one piece. Model is structured from separate walls and other objects so it shouldn’t be counted as one solid object)