145
Furthermore , our results indicated that the shape of the side of the metal portion depended on the forming precision of the FFF 3D printer .
 metal, forming, FFF 3D printer
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:
 metal, forming, FFF 3D printer