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Among the different components of a gating system ( often called rigging ) , sprue design offers a major opportunity to exploit the unlimited geometric freedom offered by 3DSP process .
 components, gating system, sprue, design, geometric freedom, process
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:
 components, gating system, sprue, design, geometric freedom, process