1591
Metal additive manufacturing processes are relatively slow , require complex preparation and post-processing treatment while using expensive machinery , resulting in high production costs per product .
 manufacturing process: Metal additive manufacturing; manufacturing process: post-processing treatment; concept or principle: production costs
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:
 manufacturing process: Metal additive manufacturing; manufacturing process: post-processing treatment; concept or principle: production costs