If you made something blink, and now it’s time for you to make something move, something like a point-to-a-satellite tracker ...

Tracking satellites and the ISS is pretty easy ... with a sturdy aluminum extrusion frame and NEMA23 steppers. But the 3D-printed parts turned out to be the Achille’s heel.

But therein lies Pettit's genius. He's brought with him to space a homemade star tracker, a device that rotates a camera to compensate for the ISS's movement. It's a variation on a tool used by ...