SpaceX is using laser sintering (generally Inconel) for a wide range of components, including pieces of the engines that flew today. They make extensive use of

SpaceX is using laser sintering (generally Inconel) for a wide range of components, including pieces of the engines that flew today. They make extensive use of laser sintering in the SuperDraco engine (including the combustion chamber, which experiences tremendously high temperatures and pressures). That being said, laser sintering is great for parts with weird geometries and structures that are hard to machine. A grid fin is really straightforward from a milling perspective, and would take advantage of the strengths of laser sintering.