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The process is repeated in which after the first laser scan , the powder bed is lowered by the amount of thickness of the layer produced initially , and then a new layer of powder material is spread on the powder bed again on top of the initial scanned layer until a fully dense built part is produced .
 concept or principle: process; enabling technology: laser scan; machine or equipment: powder bed; process parameter: layer; process parameter: layer; material: powder material; concept or principle: spread; machine or equipment: powder bed; process parameter: layer; process parameter: fully dense
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:
 concept or principle: process; enabling technology: laser scan; machine or equipment: powder bed; process parameter: layer; process parameter: layer; material: powder material; concept or principle: spread; machine or equipment: powder bed; process parameter: layer; process parameter: fully dense