My upstairs neighbor is a nurse and asked me for a mask relief strap. I had some issues with the existing designs so I made this one. It is very fast to print (about 9 minutes at .6mm) and many can be fit on a build plate at once. With this design I'm able to produce ~15 straps in a two hour print.

Set it up vertically and go. I've had the best success with orientating it parallel with the long axis of my printer. Make sure you have good bed adhesion.