1.can't feed and retract, check reason:
https://youtu.be/zvF3hFyHKZ8
2.feed not good during printing, check reason:
https://youtu.be/ZpOHLHtIk6g
3.Can not feeding and retract, nozzle is hot, the filament stuck into gear:
https://www.youtube.com/watch?v=y9-_U3lQ09w
Universal product: X1,X2,X3,X4,X2plus, X4 plus, K1, K2,K3,K4,K1plus, K2plus, K3plus,K4plus, K7,K8
4.Can not feeding, nozzle is hot, E motor broken, replace E motor video:
https://youtu.be/N6rHfAVnebc
Universal product: X1,X2,X3,X4,X2plus, X4 plus, K1, K2,K3,K4,K1plus, K2plus, K3plus,K4plus, K7,K8
5.When feeding , light not flash, nozzle not heating up, Nozzle replace video:
https://www.youtube.com/watch?v=IzpAT_1vT8I
Universal product: X1,X2,X3,X4,X2plus, X4 plus, K1, K2,K3,K4,K1plus, K2plus, K3plus,K4plus, K7,K8
6. Can not feeding because the tube under the gear is deformed, the filament can not enter into the nozzle, replace tube video:
https://youtu.be/ye1K1gCRn-8
Universal product: X1,X2,X3,X4,X2plus, X4 plus, K1, K2,K3,K4,K1plus, K2plus,K3plus,K4plus, K7,K8
7.Feeding has problem, Extruder set replace video:
https://youtu.be/v0zqibPesfs
Universal product: X1,X2,X3,X4,X2plus, X4 plus, K1, K2,K3,K4,K1plus, K2plus,K3plus,K4plus, K7,K8