2052
Post-processing of parts is also a challenge , and the options are limited therefore depending on the application the complexity of the design might need to be constrained to ensure all surfaces are accessible by required post-processing techniques .
 concept or principle: Post-processing; concept or principle: complexity; engineering feature: design; material: be; concept or principle: surfaces; concept or principle: post-processing
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: Post-processing; concept or principle: complexity; engineering feature: design; material: be; concept or principle: surfaces; concept or principle: post-processing