This nickel-alloy heat exchanger is among several that were 3D printed for the Mars Oxygen In-situ Resource Utilization Experiment (MOXIE), one of the instruments aboard NASA's Perseverance Mars rover. If conventionally fabricated, the heat exchanger would have required making two parts and welding them together; the 3D-printed heat exchanger is a single piece. https://photojournal.jpl.nasa.gov/catalog/PIA24171
Album Mars_2020_Perseverance