Although 3D printing for mass customization has fallen through on products such as footwear, the interchangeable pad system in the Vicis helmets requires only a few pieces to be customized for a fully personalized product.

Source: https://www.forbes.com/sites/carolynschwaar/2023/10/01/nfls-safest-helmets-absorb-impact-with-3d-printing-instead-of-foam/