[Amr] recently built a 3D printer and came across his first practical application for it — his jacket’s zipper broke! What we like about this project is [Amr] goes through the entire design ...

and the hiring of a bright young engineer before the world would have what we would recognize as the first modern zipper. Judson hired Gideon Sundback in 1901, and by 1913 he was head designer at ...