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4 Common defects in WAAM-fabricated component Although the mechanical properties of components fabricated by WAAM are in many cases comparable to those of their conventionally processed counterparts , there are however some AM processing defects that must be addressed for critical applications .
 concept or principle: defects; machine or equipment: component; concept or principle: mechanical properties; machine or equipment: components; manufacturing process: WAAM; concept or principle: processed; manufacturing process: AM; concept or principle: defects; material: be
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:
 concept or principle: defects; machine or equipment: component; concept or principle: mechanical properties; machine or equipment: components; manufacturing process: WAAM; concept or principle: processed; manufacturing process: AM; concept or principle: defects; material: be