3D printing

1. advantages

1.1. communication

1.2. convenience

1.3. attractive

1.4. development cost(for manufacturer)

2. disavantages

2.1. expensive(for citizens)

2.2. dangerous

2.3. need spaces

2.4. job in some fields

3. applications

3.1. medical use

3.2. manufacturing

4. general information

4.1. principle

4.1.1. 1.design

4.1.2. 2.print

4.1.3. 3.applications

4.2. history

4.3. features

4.3.1. provide 3d images

4.3.2. real