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As the SLM , the powder bed is lowered by one layer thickness , a new layer of powder is applied on top , and the process is repeated until the model is completed .
 material: As; manufacturing process: SLM; machine or equipment: powder bed; process parameter: layer thickness; process parameter: layer; material: powder; concept or principle: process; concept or principle: model
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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: As; manufacturing process: SLM; machine or equipment: powder bed; process parameter: layer thickness; process parameter: layer; material: powder; concept or principle: process; concept or principle: model