stepper motor failing to turn the gear

[Andy3D]

Hi,
My UpBox+ has suddenly failed. Overnight it started airprinting mid-print. This morning I retracted the filament and cut it off, and then tried to extrude again, and found that the filament wasnt being pulled in. So I stripped it down and cleaned the gears with a toothbrush (was some plastic dust, but nothing major). The problem seems to be that the gearwheel isnt spinning - it IS powered, but just kind of stutters in place. What would cause this, and is there a fix? Im in the middle of large job and really need this machine operational
Thanks for any tips,
Andy

[TiertimeBrook]

Hi Andy,

Try to replug the extruder cable , especialy the end that connected with the extruder back PCB, It usually become loosing when the extruder moving.

Wish that will help. if not ,then you can contact our support team by email.

Regards
Brook