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Experimental results on solid printed ( no infill ) samples , through four different- sized nozzles , have shown the newly proposed method produces a 6.5 % increase in density and a 7.2 % improvement in maximum in-plane shear stress per millimetre increase in nozzle size , compared with the aligned method of FFF .
 Experimental, infill, samples, nozzles, density, shear stress, nozzle, FFF
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:
 Experimental, infill, samples, nozzles, density, shear stress, nozzle, FFF