Two volunteers, Cristian Fracassi and Alessandro Romaioli, from Italy, used 3D Printing to create replicas of medical valves used in life-saving treatment of Corona Virus. However, the company with original patent denied them the files for creating them, but they also didn't sue them for creating illegal copies of their device. The Medical valves costing 10,000-11,000 USD, was created for as low as 1 USD and distributed in hospitals in Italy facing severe shortage of them.

Read more: https://www.theverge.com/2020/3/17/21184308/coronavirus-italy-medical-3d-print-valves-treatments