One thing that is nice is when I find another use for my printer. My Father was over one day and I knew he had modeled his house in SketchUp when doing some work on it. I decided to try and print out this floorplan
Once you have a floor plan or a model in a 3d modelling program, all you need to do is find the proper tool to export into a format the printer can use. In my case I had a plugin for SketchUp that allowed me to export the model as an STL file.