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Most cost estimations found in literature only take the process related post-processing steps into consideration and additional costs must be taken into account when the functionality of the printed part has to be improved also .
 concept or principle: cost estimations; concept or principle: process; concept or principle: post-processing; material: be; material: be
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: cost estimations; concept or principle: process; concept or principle: post-processing; material: be; material: be