DAVID 3D Scanner is a program that can use a laser and a camera to create a 3D object. The program supports most cameras with the Microsoft Windows drivers. It includes a good calibration of the camera.

David 3d Scanner Software Online

DAVID-Laserscanner is a freeware software for 3D laser range scanning. All you need to build a 3D scanner is a PC, a camera (a Web cam), a background corner, and a hand-held laser that projects a line onto the object you want to scan. So everyone can use it to scan objects without high costs, this is the big advantage over commercial solutions which are rather expensive.

What do you need to know about free software?

DAVID-Laserscanner is a freeware software for 3D laser range scanning. All you need to build a 3D scanner is a PC, a camera (a Web cam), a background corner, and a hand-held laser that projects a line onto the object you want to scan. So everyone can use it to scan objects without high costs, this is the big advantage over commercial solutions which are rather expensive.

Hp 3d Scanner

Here's how you can get to make some .obj files out of real life objects.
What you need:
-An 8$ Laser Edge form any Hardware Store;
-The David scanner program, from
David 3D Scanner

David 3d Scanner Software Download

Or, since David is generating a lot of complaints from the Readers of this Instructable, use one of these 5:

Best Free 3d Scanning Software

3d Scanning Software Download

-.Net Framework add-on from Microsoft, if you don't have it installed already;
.Net Framework
-A webcam;
-Some printed patterns
-And stuff you'll find around you house, like Styrofoam boards, and UHU Por to glue it, for
example.
If you don't like to change the Edge's batteries all the time, better add a Tranformer with 3V
output, a common Mono plug, and some soldering work, too.
Note:
For an easy scan, and good results, you better have an Airbrush around, to cover the
objects with a wash-away layer of white paint, common Gouache will do fine.
Baby powder is said to give good results on stuff you don't want to paint.

Free David 3d Scanner

This other Instructable shows you how to make a neat laserline, so have a look at it, too: