I found this part interesting:
Similarly, Jason Aspinall from Vale Visors group in Barry, said his team of five have made 280 visors to date and have orders for another 500 for University Hospital Llandough, UHW, and the Royal Gwent, as well as a multitude of doctors' surgeries, undertakers, and pharmacies.
He said: "Many folk have been using thin acetate, like the stuff used on overhead projectors, thin as paper, completely unsuitable for the face visor.
"The spec calls for 400um or more, which is the spec Vale Visors have been working to, using the approved head band design.
"So while the public making them think they're helping they really do need to understand the practicalities of using a visor with inferior visor part not being fit for purpose.
"The public should be able to help where they can so long as they make the right thing."
Especially the part about the thickness, I have opted for 240 microns which are a whole lot more solid than the normal 100 microns OHP film, my first attempt was using 100 microns and immediately thought 'this isn't good enough' hence my request for 240 microns, the spec may call for more but that is more down to the durability, 240 microns is probably around the limit for this improvised design, the public efforts would benefit from guidance and even support, that article is the first I have seen regarding any specs.
On a brighter note; a record day - just started print No 9 after getting up early