Easy and Qucik Assembly: comes with several assembled parts and all nuts you need the whole process may only take you about 2 hours. Advanced Extruder Technology: Upgraded extruder greatly reduces plugging risk and bad extrustion; V-Shape with POM wheels make it move noiseless smoothly and durable. Resume Print Function: Ender 3 has the ability to resume printing even after a power outage or lapse occurs. Protected Power Supply: with High Safety and Efficiency Only needs 5 minutes for hot bed to reach 110?. Strict Test and Reliable After-sales Service: Strict testing for key components before delivery and life-time technical supports available.