Fig. 9From: Additively manufactured nano-mechanical energy harvesting systems: advancements, potential applications, challenges and future perspectivesa 3D printing assisted bi-directional gear transmission TENG b output energy c instantaneous power output with varying external resistances d powering 375 LEDs e experimental setup f output power of the TENG used to run a thermometer [31] (Images are re-used with the permission of the publisher)Back to article page