Manual 3D thinking

Introduction of 3D thinking
To use a 3D-printer, we need to think 3D.
We are used to draw on a piece of paper, so how do you draw 3D?
If we ask a pupil to think this way, what happens to his/her mind?
They have to visualize an object standing up and look around the corner and think how they would draw this. Using 3D drawing tools and a 3D-printer helps children to visualize an object.

How can we use a 3D-printer to discover the talents of children?