https://www.cnet.com/news/ahead-of-super-bowl-2019-3d-printing-promises-safer-football-helmets/

Riddell and Carbon, a digital manufacturing startup, announced this Friday that collaboratively they've produced the first-ever 3D printed football helmet liner that can custom-fit football players' individual head shape and size. 

This process is possible due to Carbon's new L1 printer that can manufacture the bespoke liners and which the company also made public today. The financial terms of the agreement were not disclosed.