4418
The rheology of a ceramic paste is known to be a key factor in the process of additive manufacturing of ceramic parts via extrusion freeforming .
 rheology, ceramic, be, process, additive manufacturing, ceramic, extrusion
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 rheology, ceramic, be, process, additive manufacturing, ceramic, extrusion