simplest 3d scanner, Take 2!

Very simple:

You need, a stepper motor.
a 3d printer
those 2 printed parts.
an android cell phone (or tablet)
a line laser, like:

http://www.ebay.ca/itm/650nm-5mW-Red-Laser-Line-Module-Focus-Adjustable-Laser-Head-5V-good-/381374426229?hash=item58cbafec75

Download and install this app: scan3doid (around 5$)

https://play.google.com/store/apps/details?id=com.gsohler.scan3droid&hl=fr_CA

Then I suggest unplugging x motor from your 3d printer and plug your new scanner's one.