How to solve the unloading filament problem1.To check if the heaitng nozzle are heated2.Open the back case to check if that is some filament block inside the tube.3.Take off the heating nozzle to check if that is some filament block inside.Specification:Input: AC 100V-240VOutput: DC 5V 2A (Can Be Charged By Mobile Phone)Nozzle Diameter: 0.6mmOutput Materials Type: Fused Deposition ModelingMolding Method: 3D ModelingPrinting Area: UnlimitedColor:BlackPlug:EU/US/AU/UKSprinkle Speed: 6 level speed Adjustabletemperature:it can adjust temperature in degree.Material: Plastic case cover Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!