DIY respirator mask (dust only, no serious virus protection)

thingiverse

Because COVID-19 excitement in Germany makes respiratory protections sell out very often now. This is a quick and easy Plan B, probably better than nothing. It's a simple holder that keeps filter fleece around the mouth and nose (e.g., kitchen roll as a placebo or better electret-filter fleece from vacuum cleaner bags). No serious protection is guaranteed. Someone should add a valve or adjust the geometry to fit more general face shapes. Using PLA works for me, but not very well. Please try using something more flexible material and post your experiences. A lot of possible string options will work, in my case silicon-rubber-tubes did the job: outer diameter is 5mm, inner diameter is 3mm, and wall size (thickness) is 1mm. If you don't have silicon or won't print clamps but have neodym magnets available, it's possible to hold the fleece with them too. Update 14.03.2020: Adding clamps left and right to hold the fleece in position, adding conic silicon tube terminators to connect clamps and bind it loosely to the frame, breaking a PLA-print at the beginning of infills seems to give a flexible but stable enough frame. Thanks to 'rybaiho' for the comment; I will adapt the CAD files next. Update 29.03.2020: Some investigations with a disco-fog-machine found out that "kitchen-roll" is not a good filter fleece! To protect you from critical droplet infection (diameter about 2µm), it's essential to use electret filter material (e.g., fine dust filter of vacuum cleaner bags). Look on Amazon, for example: Elektret-Filtertüte Sebo-Filterbox D 8120 (https://amzn.to/2JhEnsh) or Sebo 5093ER Filterbox (https://amzn.to/3dnqTcg). Please also take a look at the MASK designed by IridiumMan: https://www.thingiverse.com/thing:4247260 for my opinion, they did the job perfectly!