How To: Make a 3D scanner with free software

Scanners have been around for a while. They allow us scan photos and documents into digital versions that are a lot less susceptible to damage over time. But what if you want to digitize the memories of something that isn't 2D? With this hacker's how-to, you'll learn a method for making a 3D scanner. To follow along, you'll need a computer, a printer, a web cam, white foam board and a laser pointer.