You can not only use your 3d printer for printing, but it is also an XYZ motion platform. By attaching a laser to the extruder, for example, you can easily convert your 3d printer to a laser engraver or even cutter.
3D printers are amazing for makers everywhere, as they enable easy, cheap, and fast progress on projects. They can't do everything though, especially if you want a different material from plastic, you're for the most part out of luck.
In terms of design for manufacturing, laser-cutting technology can have a beneficial effect on any product. Cost and quality are two major influences on the marketability of any product, and laser cutting allows for high-quality components at a lower cost overall, therefore making it possible to offer a more affordable, better quality product.