The mask I regularly use reminded me of a bird beak when it bends around my nose, so I wanted to try designing a mask that actually looks like one. I modeled it in Blender, then adjusted the scale in Fusion 360.

If you want to use this as a covid-19 mask, you'll need to add a fabric layer for it to work properly. As is it will work great for a costume accessory for parties, conventions, or Halloween.