SunFly’s invisible ink stamp notifies you when it’s time to put on more sunscreen. (SunFly Photo) Researchers say we don’t put on enough sunscreen. A Seattle startup has come up with a ...

Ink stamps can be fun to make and use, and 3D printers are uniquely positioned to create quality stamps of all kinds with just a little care. As with most things, the devil is in the details and th… ...