After searching for a good mask extender and ear saver on the web and finding nothing that would appeal me I decided to design one myself. This is very useful to extend the surgical mask cord and other types of masks and it helps to keep your ears without bruises. I put numbers on the holes so with a quick glance you already know where to put your mask cord without counting up the holes. The holes are designed so they keep the cord in so the mask extender won't fall off. You can shorten up the extender breaking it at the number you need. It works great with surgical masks and ffp2 masks. It prints in about 25 minutes in my Ender 3 with 40% infill and 0,15 mm steps. Hope it will be useful to you.