1.can't feed and retract， check reason：
https://youtu.be/644KNwb3n94
2.feed not good during printing， check reason：
https://youtu.be/ErF79LsdmOQ
3.Z axis pillar replace video：
https://youtu.be/WcwtnpMV7Yc
Universal product：NANO, NANO Plus, Minnie, Mickey
4.Print Z direction can not touch the limit switch, need re-adjust the Y axis belt：
https://www.youtube.com/watch?v=-V98KCwL9Fk
Universal product：NANO, NANO Plus, Minnie, Mickey
5.Can not feeding and retract, nozzle is hot, the filament stuck into gear：
https://www.youtube.com/watch?v=foyYLOC7L5o
Universal product：NANO, NANO Plus, Minnie, K5
6.Can not feeding, nozzle is hot, E motor broken, replace E motor video:
https://www.youtube.com/watch?v=d24x4KfrgYI&t=78s
Universal product：NANO, NANO Plus, Minnie,K5
7.When feeding , light not flash, nozzle not heating up, Nozzle replace video:
https://www.youtube.com/watch?v=W7arsOrbl10&t=34s
Universal product：NANO, NANO Plus, Minnie,K5
8.During printing, feeding is weak, Insufficient load, the gap between the gear and wheel is too big, adjustment video:
https://youtu.be/keit2FCNkpY
Universal product：NANO, NANO Plus, Minnie
9.X axis not move, X motor whole set replace video：
https://www.youtube.com/watch?v=yWcH5GJMPBI
Universal product：NANO, NANO Plus, Minnie
10.Y axis not move, Y motor replace video:
https://youtu.be/7I05G_3M99s
Universal product：NANO, NANO Plus, Minnie,Mickey
11.Z axis not move, Z motor replace video:
https://youtu.be/0jYwrtqFfl8
Universal product：NANO, NANO Plus, Minnie, Mickey
12.X axis not move, X motor whole set replace video：
https://www.youtube.com/watch?v=yWcH5GJMPBI
Universal product：NANO, NANO Plus, Minnie
13.Z axis is not parallel, adjust video:
https://youtu.be/BxRdH8tN99M
Universal product：NANO, NANO Plus, Minnie, Mickey
14.Button no function, and online printing not work as well, motherboard dead , motherboard replace video:
https://youtu.be/_WkBvP8fv9E
Universal product：NANO, NANO Plus, Minnie, Mickey
15.Extruder whole set replace video:
https://youtu.be/7w2xRKyZkKg
Universal product：NANO, NANO Plus, Minnie,K5
