It depend of the complexity of your model and the rendering scale. And how big is the final model. You have to ask the printer s who can answering you to benefit of the best printing service.
vous pouvez exporter en un seul fichier STL votre projet , tout dépend de la taille de votre impression 3D car si votre modèle est trop grand c’est mieux de recevoir plusieurs éléments pour les assembler ensemble par la suite
Well, if you are planning to print it in one whole piece, then you can export to.stl at once (whole 3d model). But if your model has several colors or to avoid supports and overhang then you might want to export your model to .STL part by part and upload those .STLs to your slicing software to print. Later on you can assemble those parts with certain glue.
Are you referring to the individual parts of the building or multiple buildings? If you have a single building then you should turn off any layers you do not wish to be printed then save the stl. With multiple buildings it is best to print them separately to all the provider to pack them efficiently in the print space.
We will be happy to work with you on this. We do excellent work with architecture
It is generally dependent on what printer type you intent to print using, however, my experience is that nothing substitutes combining all individual geometries into a singular “watertight” .stl model. This is not what designers want to hear but it is best practice and the only way to ensure quality control.
i print with multiple files to enhance quality, because flat prints get better resluts and also most of the time models are large then the max print dimensions