BMV uses bag valve masks, or Ambu bags, to supply a person with oxygen. A bag valve mask is a handheld tool that a medical professional can use to pump oxygen into a person’s lungs.

Bag valve masks are “ubiquitous across even remote and low-resource areas,” he notes. “Automating a way to deliver air through them could address a real need.” ...

Normally, each valve would cost about $100. By 3D printing them, the cost drops to between $10 to $15 a piece, WPI said. “This is what we do at WPI,” said Popovic.

Take for example, the Ambu bag, or bag valve mask. There's one in every Baltimore County emergency vehicle. It has been around since 1950s with makeovers along the way. Now, it has filters.