Thin L wrench or nozzle cleaner
New cutter
Move the hotend to the center of the printer, leaving some space for operation on the left side of hotend.
Take off the hotend cover of the printer diagonally upward with your hands. Note that the cover is magnetically attached and is not fixed with screws.
Use a nozzle cleaner or L wrench to reach in from the left side of the extruder gear and touch the cutter.
After the tool is hooked onto the cutter, pull the cutter out slightly to the left.
Take out the new cutter and install it into the cutter position
Note:
The direction of the cutter: the grooved side of the cutter holder should face upwards, as shown in the figure below.
Make sure the extruder is free of filament and re-run "Input Shaping" to calibrate the cutter
Replace Cutter
https://youtu.be/c0EKlBXRflk