2050
To decrease the threshold of customization of surface structure for the public when using AM , in , an interactive CAD design tool is proposed .
 engineering feature: surface structure; manufacturing process: AM; enabling technology: CAD; machine or equipment: tool
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:
 engineering feature: surface structure; manufacturing process: AM; enabling technology: CAD; machine or equipment: tool