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Barts is one of the country's leading teaching hospitals and centres of medical research excellence, so I'm sure they've given this some thought!
That maybe, but there is a difference between deciding that a product meets requirements in a particular moment of desperate need as opposed to a product actually meeting standards. I'm not sure what "pass infection control rules" means as it varies so much for what object you are assessing and how it is used.
What I do know, from a consultancy piece I did for a sex toy manufacturer where we made things and had them lab tested (in know, i know), is that freshly printed objects are pretty much sterile due to their printing temperature (200 degrees+), its what happens to that object afterwards that is problematic. Most 3d printing plastics and certainly the ones most people use at home denature on contact with various solvents and cannot be heat treated due to their low plasticity point. This is why I am so sceptical that a 3d printed visor could be reused without lowering hygiene standards. I freely admit that inserting an object into a bodily cavity for pleasure purposes is a different use case than hanging an object off your face for infection control :D
On the subject of what Barts and QMUL are currently doing, I understand that they have reached an agreement with Halma who are going to produce their design using injection moulding so they can get away from the problems introduced by 3d printing. EDIT: Being slow production speeds, fragility, infection control.
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Stonehedge
Barts is one of the country's leading teaching hospitals and centres of medical research excellence, so I'm sure they've given this some thought! Also the sixth prototype was to pass infection control rules, so it seems they must have this sorted:
https://www.standard.co.uk/news/health/visors-dentists-3d-printers-front-line-a4409141.html
That said, the School of Dentistry were very clear that they're doing this because they didn't feel the kit that was available was up to scratch. So this is better, but nobody is pretending that 3D printing your own masks is anything close to ideal.