-High PEEP (obviously any CPAP machine can do this)
-Low plateau pressure (probably possible, that's just software)
-Low tidal volume and high breathing rate. Breathing rate is just a cycling variable so should be software only issue. Managing low tidal volume will require the machines to have a flow sensor. Do you know if any of your machines do? If so, then this is likely fixable with only software.
My interpretation of that article is it must refer to the patient valve as those are one-time use (as they in contact with contaminated patient exhalations) rather than O2 inlet valves which are not disposable. Patients are breathing high-ish O2 but obviously not HP pure O2 so 3d printed is fine for that.
3D printing is useful for cases like that where due to logistics there is a temporary shortfall in local supply. I suspect that 3 months from now we are unlikely to be using those measures as global production and distribution of ventilator consumables ramp up.
There's an open source app called SleepyHead that can show you all the data in detail. It appears the maintainer burned out but the downloads are still available.
So it seems modern CPAP has all that's needed? Doctors can even monitor it remotely or via the cloud. It's intended to let clinics monitor patient progress without needing visits, so it's all pretty easy to use.
I don't know how many active machines are pre-APAP/BiPAP/A-Flex (there are different names for it). A comment below says 90% but this seems very high to me.
I wonder if it's possible some doctors don't realise the machines have this feature or it's importance? When I first was prescribed CPAP the machine did not come with bi-level flex enabled, it made it very hard to tolerate. I pushed through it for months but when I "cracked" the doctor-only DRM (i.e. looked up the cheat code on Google) and enabled A-Flex it instantly became way easier to handle the machine and my AHI scores were super low; big success. Doctor was quite happy with my altered configuration. I was just surprised such a basic thing hadn't been explained to me.
I suspect a lot of CPAP machines support bi-flex but it either isn't activated or could be added via a software update. I don't think you need extra components.
Oxygen valves come from here: https://learningenglish.voanews.com/a/volunteers-produce-3d-...