My 3D-printed custom nose bridge. Images courtesy of the author I wear glasses (not pictured above for photo reasons), and for the last nine months they’ve fogged up every time I’ve gone outside. For some reason, I haven’t been able to find a mask that’s comfortable and keeps my breath from blowing up into my glasses. Thanks to the magic of 3D printing, I’ve come up with a solution, and it works surprisingly well. And you can do it, too, if you have access to a 3D printer, some free software, and someone to help measure your face. (You can measure your face yourself, but that’s a little harder.)