Ender 3 nozzle brush

@OnlyShellsRemain I've create a macro (Klipper). Change the variable values to your liking. You can use it in Marlin and others as well:

[gcode_macro CLEAN_NOZZLE]
gcode:
variable_start_x: 75
variable_start_y: -14
variable_start_z: 4.5
variable_wipe_dist: -50
variable_wipe_qty: 6
variable_wipe_spd: 3000
variable_raise_distance: 10
variable_clear_distance: 10
gcode:
{% if "xyz" not in printer.toolhead.homed_axes %}
G28
{% endif %}

G90 ; absolute positioning
## Move nozzle to start position
G1 X{start_x} Y{start_y} F6000
G1 Z{start_z} F1500
## Retract filament
G1 E-2 F3000
## Wipe nozzle
{% for wipes in range(1, (wipe_qty + 1)) %}
G1 X{start_x + wipe_dist} F{wipe_spd * 60}
G1 X{start_x} F{wipe_spd * 60}
{% endfor %}
## Raise nozzle
G1 Z{raise_distance} F3000
G1 Y{clear_distance} F6000
G1 E6 F3000

@goTVm If you look at the exploded view you can see how it will be clamped to the heated bed frame (not the heatbed itself!).
As for the measurement: See the photo and buy it from ebay or Amazon.