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However , the build rate of both desktop and professional FFF systems is comparable ( ∼10 ’ s of cm3/h at ∼0.2 mm layer thickness ) , suggesting that fundamental aspects of the machine design and process physics limit system performance .
 build rate, FFF, s, mm, layer thickness, machine, design, process physics, limit, performance
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:
 build rate, FFF, s, mm, layer thickness, machine, design, process physics, limit, performance