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Additive manufacturing ( AM ) allows for the production of custom parts with previously impractical internal features , but comes with the additional possibility of internal defects due to print error , residual stress buildup , or cyber-attack by a malicious actor .
 Additive manufacturing, AM, production, defects, print, error, residual stress
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 Additive manufacturing, AM, production, defects, print, error, residual stress