3217
While the mainstream AM methods utilize high-energy power beams to melt metal powders , other low-cost alternatives are also being developed ( e.g. , direct ink printing ) .
 AM, power, melt, powders, ink printing
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:
 AM, power, melt, powders, ink printing