(via YouTube by AugmenteDev)Here is a short video that demonstrate how to use Augment to preview a 3d model before printing, in real size. You can also rescale the model and get the scale factor to apply.
Download the app, print the marker and play with the numerous Cubes already available. You can even create your own ! Get the app on the Android Market or on iTunes, it's free !
Augment on iOs : http://itunes.apple.com/us/app/augment/id506463171?l=en&ls=1&mt=8
Augment on Android : http://market.android.com/details?id=com.ar.augment
Markers : http://markers.augmentedev.com