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This effect is utilized to demonstrate the printing of a commercial polymer clay , an aluminum-polymer composite and a stiffened fondant with viscosities up to 14,000 Pa·s with minimal residual porosity at rates comparable to thermoplastic extrusion .
 polymer clay, composite, residual, porosity, thermoplastic, extrusion
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:
 polymer clay, composite, residual, porosity, thermoplastic, extrusion