Resume Print: Ender 3 has the ability to resume prints even after a power outage or lapse occurs. Easy and Qucik Assembly: It comes with several assembled parts, you only need about 2 hours to assemble 20 nuts well. MK-10 Extruder greatly reduces plugging risk and bad extrustion; V-Slot with POM wheel make it move noiseless, smoothly and durable. Strict Test: 24 Hours testing for key components before delivery and life-time technical support. Safety protected Power supply, Only need 5 minutes for hotbed to reach 110?. Note: As an authorized distributor, we Comgrow offer 100% original Creality 3D Printer, and can offer professional after sales technical support.