Have a look at this thread on the rLab site.
Alex Gibson is organising a large scale “santised” pop-up printer farm to attempt to meet the short term needs of Reading NHS.
There is useful information on there about the practicalities of printing files and sources for the acetate shield. There is also some discussion of necessary hygiene precautions. All might be useful if you are going to “roll your own”.
If you are not going to roll your own but have a printer that you are willing to contribute to the Reading endeavour, then this a link to a Googel Docs spreadsheet where you can volunteer to lend your printer(s) to the farm.