http://www.3ders.org/3d-printing-basics.html

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Table of contents:

What is 3D printing?
3D printing technologies
3D Printing history
3D printing applications
What is a 3D printer?
Whats the difference between rapid prototyping machine and a 3D printer?
What can you make with a 3D printer?
Who make 3D printers?
How much cost a 3D printer?
How to build a 3D printer?
What are the materials used to print 3D objects?
What 3D modeling software is suitable for a beginner in 3D design?
I have no 3D design experience, how long does it take to learn 3D modeling?
Where can I get 3D models online?
Where can I find online 3D printing service?