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A new 3D printing ink , a bionanocomposite based on alginate , methylcellulose and magnetic nanoparticles ( MNPs ) was used to print pre-designed high-quality 3D structures .
 3D printing, alginate, nanoparticles, print, 3D structures
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:
 3D printing, alginate, nanoparticles, print, 3D structures