QUOTE : Variety is free: It costs no more to make every product different than to make them all the same. 2. Complexity is free: A minutely detailed product, with many fiddly little components, can be 3-D printed as cheaply as a plain block of plastic. The computer doesn’t care how many calculations it has to do. 3. Flexibility is free: Changing a product after production has started just means changing the instruction code. The machines stay the same.