3d-printed ring (IMAGE) Martin-Luther-Universität Halle-Wittenberg Caption This is what the ring looks like that could help repel insects. Credit Uni Halle / Fanfan Du Usage Restrictions Use for covering the research with appropriate credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.