The nozzle wiper is a flexible tool mounted on the edge of the waste chute to clean the nozzles before printing.
Replace the nozzle wiper when it is deformed or cracked.
Power off the printer.
Power off the printer and remove the top glass cover. Move the tool head out of the chip chute for better access to the nozzle wiper.
Remove 1 screw and remove the nozzle wiper.
Install the new nozzle wiper in its place.
Screw in 1 screw and put back the glass cover.
Check that the nozzle wiper and screws are properly seated.