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Metal powder bed additive manufacturing technologies , such as the Electron Beam Melting process , facilitate a high degree of geometric flexibility and have been demonstrated as useful production techniques for metallic parts.However , the EBM process is typically associated with lower resolutions and higher surface roughness compared to similar laser-based powder bed metal processes .
 Metal powder, bed, additive manufacturing, as, Electron Beam Melting, flexibility, as, production, metallic, EBM, surface roughness, powder bed, metal
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 powder, bed, additive manufacturing, as, Electron Beam Melting, flexibility, as, production, metallic, EBM, surface roughness, powder bed, metal