8178
This study investigates the potential of lower-cost , more widespread and accessible FFF-based 3-D printing of PDCs .
 investigates, 3-D
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:
 investigates, 3-D