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We also demonstrate the ability to embed and connect surface mounted components in 3D printed objects with a low-cost ( $ 1000 in parts ) , open source dual-material 3D printer .
 surface, components, 3D printed, source, dual-material, 3D printer
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:
 surface, components, 3D printed, source, dual-material, 3D printer