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To address the effect of porosity and layer adhesion on mechanical properties ( which can sometimes result in 27–35 % lower ultimate tensile strength when compared to plastic injection molding ) , an approach was employed to reinforce 3D printed polycarbonate ( PC ) parts with continuous carbon fiber ( CF ) bundles .
 porosity, layer, adhesion, mechanical properties, ultimate tensile strength, plastic injection molding, 3D printed, PC, continuous carbon fiber
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:
 porosity, layer, adhesion, mechanical properties, ultimate tensile strength, plastic injection molding, 3D printed, PC, continuous carbon fiber