This 3D printed design will turn your iPhone into a cheap portable 3D scanner utilising the AWESOME Autodesk Remake software
The idea is that you use your phones onboard camera to take the pictures while the turn table rotates. This is acheived by using the headphones that were supplied new in the box
The volume controllers trigger the camera remotely, taking 50 pictures for every complete rotation of the turntable.
Full project tutorial available here