What are the materials largest and most expensive 3-D printing machines work with?

In what fields are modern largest and most expensive 3-D printing machines popular?

Largest and most expensive 3-D printing machines are capable of directly producing complex plastic, and metal and alloy components.

What makes large 3-D printing machines useful?

Older generation feels more comfortable with the printed materials.

Digitizing information will inevitably entail the extinction of printed materials.

E-book readers are less expensive than touch-screen tablet PC's.

What is the first step in all 3-D printing processes?

What are medical applications of 3-D printing?

Medical applications of 3-D printing also have a lot of potential.

What does the time of the printing process depend on?