3D-printed revolving devices can sense how they are moving

https://techxplore.com/news/2023-03-3d-printed-revolving-devices.html

"smart hinges know when door opened, or gears inside motor indicate rotating speed... sensing angular position, rotation speed, and direction of rotation printed directly into moving parts using conductive 3D filament... multi-material 3D one pass printing... MechSense incorporating into turbines, motors, AR... sensor includes 3 patches made from conductive material printed into stationary plate, each separated from its neighbors by nonconductive material. 4th patch printed into rotating plate"