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Plastic products(ultrasonic welding plastic) in need of repair at Family or studio is inconvenient to disassemble,traditional tools are easy to hurt main board It is very difficult to cut with manual cutting knife for high-up fans in face of cabinet and delicate plastic model.And the edge is uneven. School Hand Lesson.It is difficult to control the power of traditional tools evenly and accurately,resulting in surface irregular and not fine. Because of the corners out of reach,no matching cutter,blade,It is hard to work with existing tools for technician. Car modification division use traditional electric tools,electric iron,easily producing powder,burr and material melt,and affecting appearance.With magic plastic knife,No dust, No burr,good melt surface.