7398
These samples were structured using standard infill patterns commonly used in 3D printing , allowing easy incorporation with current 3D printing technology .
 concept or principle: samples; concept or principle: standard; process parameter: infill; manufacturing process: 3D printing; enabling technology: 3D printing technology
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: samples, standard, infill, 3D printing, 3D printing technology 
Answer:
 concept or principle: samples; concept or principle: standard; process parameter: infill; manufacturing process: 3D printing; enabling technology: 3D printing technology