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The print quality and mechanical properties of the printed PEEK are also improved with the incorporation of IF-WS2 nanoparticles .
 print quality, mechanical properties, PEEK, nanoparticles
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:
 print quality, mechanical properties, PEEK, nanoparticles