This is a remix from Stefan. 

He made a nozzle wiper for the original Ender 3, but that one doesn't fit the v2. This one does now.

It attaches to the two bolts on the right side of the X-axis and requires no modification to the printer. This needs to be printed with supports and the brush needs to be glued onto the part.

The brush moves with the Z axis and can be used on any layer.

 G-code:

You need to add Start G-code to your slicer:

; Ender 3 Custom Start G-code
G92 E0 ; Reset Extruder
G0 Z5.0 ; Move Z up by 5
G28 X ; Home X
G0 X245 F6000; Clean nozzle >
G0 X234 F6000; Clean nozzle <
G0 X245 F6000; Clean nozzle >
G0 X234 F6000; Clean nozzle <
G28 ; Home all axes

Print instructions

• Rafts: No
• Supports: Yes
• Resolution: 0.2
• Infill: 20%