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The main objective of the optimization and re-design process is the reduction of the structural weight where special attention needs to be paid to the specific manufacturing process of powder bed fusion which is a powder based layerwise additive manufacturing process .
 optimization, process, reduction, weight, be, manufacturing process, powder bed fusion, powder, additive manufacturing process
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:
 optimization, process, reduction, weight, be, manufacturing process, powder bed fusion, powder, additive manufacturing process