3D printing small objects is not a big issue when you have a decent 3D printer. Larger models are a different story though. Ai Build is working on an affordable large scale robotic 3D printing technology that makes it possible to manufacture complex forms faster. You can 3D print structures up to 3.2m x 2.4m x 2.8m with PLA and ABS based materials.
These guys use 6-axis robots to offer more flexibility in extrusion path and direction. Different layer height and thickness options are available. More info is available here.