Letters From the Fab Academy, Part 4

March 10th, 2010 |

In this series, "Letters from the Fab Academy," Shawn Wallace, member of AS220, the Providence, RI community arts space, shares his experiences with the Fab Academy, a distributed learning collaborative, built on the infrastructure of the Fab Lab network. -- Gareth

3D Scanning

By Shawn Wallace

Victor Freundt prints a project using the ZCorp printer at the Barcelona Fab Lab.

When working with 3D scanning and printing equipment, it quickly becomes apparent that objects are nowhere near as fungible as MP3s. We'll have to wait a while for the day when every teenager is capable of casually copying real-world objects. However, it is surprisingly easy to hack together a crude 3D scanner from commodity cameras, projectors, and hardware you probably have in a couple of junk drawers in your shop.

A good place to start is with the Modela mini mill, which has a piezo-based needle sensor attachment that can be used for scanning small objects. The machine records the plunge depth at the point it contacts the object and the software that comes with the Modela (Dr. Picza) converts these points into a 3D mesh. Here's an example of using Dr. Picza to scan a small shell from Benito Juarez from the Barcelona Fab Academy site: