Open Source 3D scanning
I did find only one 3d scanner which uses structured light. There is many projects using a laser diode. And these systems are completely opensource.

Structured Light

Structured Light 3D Scanning by kylemcdonald


http://www.instructables.com/id/Structured-Light-3D-Scanning/?ALLSTEPS




Laser diode

Sardauscan


http://www.instructables.com/id/Build-a-30-laser/?ALLSTEPS
https://github.com/Sardau/Sardauscan
http://www.thingiverse.com/thing:702470




ATLAS 3D Scanner


http://www.freelss.org
http://www.thingiverse.com/thing:1280901
https://www.kickstarter.com/projects/1545315380/atlas-3d-the-3d-scanner-you-print-and-build-yourse/posts/1475722




Ciclop


http://diwo.bq.com/en/tag/ciclop/
https://github.com/bqlabs/ciclop




3D(ollar) Scanner


https://hackaday.io/project/2021-3dollar-scanner
http://www.instructables.com/id/Lets-cook-3D-scanner-based-on-Arduino-and-Proces/?ALLSTEPS




"Super Make Something" Tutorial On How To Build a Simple 3D Scanner


https://www.youtube.com/watch?v=-qeD2__yK4c
http://www.thingiverse.com/thing:1413891
http://diy3dprinting.blogspot.de/2016/04/super-make-something-tutorial-on-how-to.html




Different method

$15 3D scanner consists of a tub of milk and a smartphone

Interesting idea of using milk and phone.


http://www.instructables.com/id/GotMesh-the-Most-Cheap-and-Simplistic-3D-Scanner/
http://www.3ders.org/articles/20160423-this-3d-scanner-consists-of-a-tub-of-milk-and-a-smartphone.html