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In this work , a cost effective air-water polymer heat exchanger made of thin polymer sheets using layer-by-layer line welding with a laser through an additive manufacturing process was fabricated and experimentally tested .
 material: polymer; machine or equipment: heat exchanger; material: polymer; concept or principle: layer-by-layer; manufacturing process: welding; enabling technology: laser; manufacturing process: additive manufacturing process; concept or principle: fabricated
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:
 material: polymer; machine or equipment: heat exchanger; material: polymer; concept or principle: layer-by-layer; manufacturing process: welding; enabling technology: laser; manufacturing process: additive manufacturing process; concept or principle: fabricated