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However , using a thinner slice printing model leads to a longer total printing time in the conventional DLP approach , which significantly reduces printing efficiency .
 concept or principle: slice; concept or principle: model; manufacturing process: DLP
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: slice, model, DLP 
Answer:
 concept or principle: slice; concept or principle: model; manufacturing process: DLP