7893
For this flexible and extensible 3D printing system , the influences of the multi-robot layout on the maximum reachable area and the geometry adaptability are discussed .
 3D printing, layout, area, geometry
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, layout, area, geometry