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In this article a material description for polymer powder bed fused also or selective laser sintered ( SLS ) PA12 ( Nylon-12 ) , which is a common 3D printing plastic , was investigated , using the Finite Element Method ( FEM ) .
 material, polymer, bed, selective laser, SLS, PA12, 3D printing, Finite Element Method, FEM
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:
 material, polymer, bed, selective laser, SLS, PA12, 3D printing, Finite Element Method, FEM