I have no clue about softer materials, but setting up the tooling for making the simplest of plastic parts is a multi-step process where each step takes weeks.

I have no clue about softer materials, but setting up the tooling for making the simplest of plastic parts is a multi-step process where each step takes weeks. And, for roughly the same reasons as in software development, making that shorter is likely to be both expensive and drop some quality. With medical equipment you generally don't want to drop quality. So, if making these masks is any similar to the only industrial process I know about, we might have the needed capacity just in time for the autumn rebound.