Yeah, a $100 ventilator will replace a $30,000 ventilator.
I’ve got some viruses to sell you.
You're right. Maybe a $100 machine to replace a $300 machine. But not much more. I've seen 3D printer builds that use under $200 in parts that will do the job of maybe $1,000 ventilators. But no way replacing a sophisticated machine. The Tesla prototype looks promising, replicating features of very expensive machines, but the Tesla machine is also expensive (donated by Tesla). No way to do it for $100.
Even the $30k ventilator damages the lungs.