Undersea acoustic transducers can be made by 3D printing the piezoelectric ceramic components. Sonar for small UAV's is one potential application. Such a cool project!

https://www.mitre.org/news-insights/impact-story/beneath-deep-3d-printing-opens-novel-wave-maritime-opportunities

#3DPrinting #Ceramic3DPrinting #AdditiveManufacturing #Lithoz