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Changes in thermal diffusivity affect FFF more than BAAM , with FFF exhibiting a local maximum in weld time at the thermal diffusivity of ABS .
 concept or principle: thermal diffusivity; manufacturing process: FFF; manufacturing process: FFF; engineering feature: weld; concept or principle: thermal diffusivity; material: ABS
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: thermal diffusivity; manufacturing process: FFF; manufacturing process: FFF; engineering feature: weld; concept or principle: thermal diffusivity; material: ABS