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4.2 Additive manufacturing Additive manufacturing , also referred to as solid freeform fabrication , rapid prototyping or 3D printing , involves processing methodologies that are capable of producing structures by depositing materials layer-by-layer resorting to a computer generated design file .
 manufacturing process: Additive manufacturing; material: Additive; material: as; manufacturing process: freeform fabrication; enabling technology: rapid prototyping; manufacturing process: 3D printing; concept or principle: materials layer-by-layer; enabling technology: computer; engineering feature: design
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: Additive; material: as; manufacturing process: freeform fabrication; enabling technology: rapid prototyping; manufacturing process: 3D printing; concept or principle: materials layer-by-layer; enabling technology: computer; engineering feature: design