6004
Considered parameters included the extrusion temperature , horizontal speed , in-situ applied hot end voltage , and bed material .
 parameters, extrusion, in-situ, hot end, bed
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:
 parameters, extrusion, in-situ, hot end, bed