1734
The final 3D printed objects , the students ’ presentations , their experience , as reflected in their final reports , and their personal written evaluations , lead to the conclusion that the projects served as useful learning experience for engineering education .
 manufacturing process: 3D printed; material: as; material: lead; material: as; application: engineering
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: 3D printed, as, lead, as, engineering 
Answer:
 manufacturing process: 3D printed; material: as; material: lead; material: as; application: engineering