Hardware startup Normal_today launched (US-only) its line of custom 3D-printed earphones that you order using an app to take photos of your ear. Finding a comfortable pair of one-size-fits-all earphones is a difficult task. Headphones tend to be more forgiving since they’re not actually inside of you, but earphones that stay in when exercising without also giving you a headache are another thing altogether. To pre-order a set of Normal earphones, you’ll need to download the firm’s iOS or Android app, as there’s currently no Web shop. The app will help you take a series of photos as you turn...

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