Loads of market opportunities.
Have a talk to larger home builders, architects and self builders.
I can build a model of each floor 8" X 10" that sit on top of each other and even a roof. I charge £100 per floor.
Because my printer is in full colour I can print the bricks on the outer walls and printed wallpaper on the inside. I print the furniture on the inside to give scale to the model.
The cost to me is 10% of my build cost so each floor cost me £10 plus my time and takes about 5/6 hours to print.
It is surprising how many go back to the drawing board with the design to tweak room sizes or doorway positions and it is a much lower cost than changing on site.
Some larger architect offices employ an IT team to change flat 2D plans into 3D models for clients but most small ones outsource if they even offer the option.