3D is the ultimate thing you can use if you are looking for a perfect clarity in the picture you print. If you are using an architect or an interior designer, the 3D printer can produce a live image of the design you make. It will be easy for you to the make your client understand they will get.
Also if you are a civil engineer and making plans for the buildings, a 3D printer can really prove to be helpful. Though till now only line diagrams are used for the site plans, but if 3D print out can be used, it will be easy for the site engineers, workers and the customers to understand the entire thing.
Not only in professional field, you can even use 3D printer to take print out of pictures. If you have presentation to be printed, 3D printer will provide ultimate clarity to the pictures. The pictures can attract anyone at the first go if printed using a 3D printer.