1531
From a 3D printer to another , designer does not answer to the same need and accuracy is often decisive to get a reliable product or a functional mechanism .
 machine or equipment: 3D printer; process characterization: accuracy; concept or principle: functional mechanism
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:
 machine or equipment: 3D printer; process characterization: accuracy; concept or principle: functional mechanism