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This contact-based 3D printing system has drawbacks such as overfilling of material at locations where there is a change in the direction of the trajectory , thereby reducing the printing quality .
 3D printing, as, material, quality
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:
 3D printing, as, material, quality