We know about 3D printing with plastic, but what about printing magnetic fields? This video by Destin Sandlin looks at how Polymagnet has come up with a way of printing magnetic fields to order. How about printing a child proof spring latch, with no springs? Or your logo as a magnetic field?
The Polymagnets segment starts 2 1/2 minutes into the video. The link below has more information on Polymagnet and where you can purchase your own “spring latch”.