Whats the difference between a basic rapid prototyping machine and a 3D printer?

3D printers are the simple version of rapid prototyping machines. It is lower lost and less capable. 

Rapid prototyping is a conventional method that has been used by automotive and aircraft industries for years.
In general 3D printers are compact and smaller than RP machines. They are ideal for use in offices. They use less energy and take less space. They are designed for low volume reproduction of real objects made of nylon or other plastics. That also means 3D printers make smaller parts. Rapid prototyping machines have build chambers at least 10 inches on a side, a 3D printer has less than 8 inches on a side. However a 3D printer is capable of all the functions of rapid prototyping machine such as verifying and validating design, creating prototype, remote sharing of information etc.

3D printers are less accurate than rapid prototyping machines. Because of its simplicity the material choices are also limited.

Rapid prototyping, especially CNC machining are widely used in the manufacturing industry, especially in the automotive, aerospace, and military industries. CNC technology has developed rapidly in both hardware and software.

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