1. What does 3D stand for ?
3D stand for 3dimension.
2. When did the term 3D printing first appear ?
The term 3D printing appear in
mid-90s.
3. What passea the over the object and creates a 3D picture of the shape ?
a laser passes over the object and creates a 3d picture of the shape.
4. How thick in each layer ?
Each layer is only about 0.1 mm thick.