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Additive manufacturing , also known as 3D printing , is defined asa process of adding materials to fabricate objects from three-dimensional models in successive layers , versus traditional subtractive manufacturing methods .
 manufacturing process: Additive manufacturing; material: as; manufacturing process: 3D printing; concept or principle: process; concept or principle: materials; manufacturing process: fabricate; enabling technology: three-dimensional models; manufacturing process: traditional subtractive manufacturing
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: Additive manufacturing; material: as; manufacturing process: 3D printing; concept or principle: process; concept or principle: materials; manufacturing process: fabricate; enabling technology: three-dimensional models; manufacturing process: traditional subtractive manufacturing