8420
A heated build environment in Fused Filament Fabrication ( FFF ) additive manufacturing ( AM ) is used to promote layer bonding in printed parts and reduce the difference in temperature between the extrusion and environment decreasing the shrinkage , residual stresses , and part deformation .
 build, Fused Filament Fabrication, FFF, additive manufacturing, AM, layer, bonding, temperature, extrusion, shrinkage, residual stresses, deformation
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:
 build, Fused Filament Fabrication, FFF, additive manufacturing, AM, layer, bonding, temperature, extrusion, shrinkage, residual stresses, deformation