[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 ...

Drivers should prepare for I-490 lane closures and Exit 27 ramp shutdown. Learn safe zipper merge tips and avoid construction delays.

A zipper merge operates like a zipper on a jacket. Drivers approaching the merge must perform a late merge, taking alternating turns—similar to how the teeth of a zipper come together.