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While the mechanical , thermal , optical , and electrical properties of additive manufacturing ( AM ) polymer composites are being actively studied , the magnetic properties of AM parts have seen much less attention .
 mechanical, optical, electrical properties, additive manufacturing, AM, polymer composites, properties, AM parts
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:
 mechanical, optical, electrical properties, additive manufacturing, AM, polymer composites, properties, AM parts