904
To avoid this situation , specialists must be consulted throughout the printing process ; however , the shortage of trained personnel familiar with AM can create a bottleneck during design .
 be, printing process, AM, bottleneck, design
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:
 be, printing process, AM, bottleneck, design