The actual material being printed on is usually paper which is out of wood, how ever the printer may be made out of metal, and I am confused on which one you are asking about.
Answer: Classical Era (latter half of 1700s)
To repair body tissues
Maintain PH levels
Antibodies
Enzymes (like DNA polymerase)
Hormones
Chose any two
1-3, 2-1, 3-2 that should be the correct order
It can be a way of communication, space filling decor and light spectacles