If you have a 3D printer and wish to help support national effort in 3D printing visors for regional personnel (NHS personnel, GPs, Care-workers, Care-assistants, residential-home-workers, Parole officers, etc) at risk exposed to COVID19, then https://www.3dcrowd.uk is coordinating efforts to supply coordinated and safe approach visors to people who need them, you will be able to volunteer via this site to covid-19volunteersuk.slack.com, the efforts in the south east are being coordinated by #zsouth_east and #south_east_kent.
The design that can assist for larger 3D printers;
For smaller 3D printers are engineers have developed a variation of this design to be printed in 3 parts. The necessary 3D files are attached for UMGo version facial shield. Feedback from University of Swansea team to ensure our safety and others when producing visors things you remember and do;
Manufacture and assemble practicing social distancing, and as if you were manufacturing for food to be sold to the public (Trading standards approach):
- more than one person ensure social distancing or more
- clean clothes washed at 60°C for 15 minutes
- wash hands regularly for 20 seconds, and sanitize hands using 62-71% alcohol sanitizer,
- face mask, and hair nets.
- disinfect manufacturing and fabrication surfaces with 62-71% alcohol
Fabrication and packaging:
- Use lint free cloth not to damage visor
- Shake the visor when fabricated to check it does not fall part when in use
- Each face visor to be placed in zip bag and sealed
- Label each zip bag, showing non-sterile, single use, date of manufacture
- Store in cardboard box, label box of content, and date sealed.
- Quarantine for 72hrs before use
The science to support this approach to ensure we do no more harm:
- van Doremalen et al (2020) highlighted in New England Journal of Medicine that COVID19 is not as stable on cardboard, no viable SARS-COV-2 measured after 24 hrs, and SARS-COV-1 not viable after 8hrs. Whereas plastic and stainless steel 72hrs before non viable SARS-CoV-2.
- Kampf et al (2020) identified the most effective method of surface disinfecting procedures to kill SAR-COV-2 within 1 minute on surfaces is 62-71% ethanol, 0.5% hydrogen peroxide or 0.1% sodium hypochlorite.
- Chan et al (2010) SARS-COV non-viable after exposure to heat above 56°C for 15 minutes