mask cord lock
thingiverse
This is great for mask that are too big for your ears. Just squeeze the mask's ear strings together and use a toothpick or other small item to push the ear strings through the cord lock.
Download Model from thingiverse
With this file you will be able to print mask cord lock with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on mask cord lock.