1677
The STL file format is widely used and approximates the 3D model by a surface that is constructed using triangles .
 manufacturing standard: STL; manufacturing standard: file; application: 3D model; concept or principle: surface
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 standard: STL; manufacturing standard: file; application: 3D model; concept or principle: surface