6123
However , due to the layer-wise nature of the process , surface roughness is formed between layers , thus influenced by layer thickness and other processing parameters .
 process, surface roughness, layer thickness, parameters
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:
 process, surface roughness, layer thickness, parameters