A network of small businesses, universities and enthusiasts used 3D printers to make millions of pieces of personal protective equipment last year. That helped mitigate supply shortages in some cases, but it\u2019s not clear how useful the technology will be for the next pandemic.\nFollow Medically Necessary on Apple Podcasts\nFollow Medically Necessary on Spotify\nMore FreightWaves Podcasts\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices