8095
The polypropylene feedstock material optimization was conducted by a combination of a lab-scale filament rod processing method and utilizing printed square tubes to optimize printing performance .
 material: polypropylene feedstock; material: material; material: filament; concept or principle: printing performance
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: polypropylene feedstock, material, filament, printing performance 
Answer:
 material: polypropylene feedstock; material: material; material: filament; concept or principle: printing performance