8584
Although this study did not attempt to optimize the fracture performance of FFF specimens , the results demonstrate that the proposed methodology is suitable for design and optimization of FFF processes for improved interlayer fracture performance .
 fracture, FFF, methodology, design, optimization, FFF, fracture
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:
 fracture, FFF, methodology, design, optimization, FFF, fracture