The N95 masks being delivered to hospitals and nursing homes in my area have much shorter elastic bands than they used to. This is a mask adapter that is 8.25" long but can still be printed quickly for mass production. It can also be trimmed easily by the user if it is too long.

I found a 4.4" version of this design in an .STL file format on Thingiverse. I printed many of these but they were not usable in my area due to the shorter elastic straps. I badly wanted to find the original contributor to give them credit for giving me a starting point but I was unable to. I converted the original STL to an SLDPRT, modifed the length, added some more strap notches and have attached the SolidWorks file if anyone would like to modify it further.

I print these in batches of seven on my Ender 3 at a speed of about 17 minutes each.

Stay safe!!