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The build platform is then lowered and a new layer of powder is spread across the previous using a roller .
 machine or equipment: build platform; process parameter: layer; material: powder; concept or principle: spread; machine or equipment: roller
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:
 machine or equipment: build platform; process parameter: layer; material: powder; concept or principle: spread; machine or equipment: roller