Creality Ender 3 V3 SE LED Light Bar

This mounts are a combination of the two models:

1. https://www.printables.com/model/3267-led-light-bar-prusa-i3-mk2mk3 - was used as the base model.
2. https://www.printables.com/model/590337-ender-3-v3-creality-light-bar-retrofit - reused the part of the model which screwing into the top of the gantry.
    

No support is needed, but it’s probably better to print this model with a high infill value.

The LED profile

It is designed to use a regular aluminium profile with a size of 7 x 17.4 mm (9 x 17 mm with a light diffuser).

Two parts of the profile will be required, each with a length of approximately 295 mm.

The LED strip

Any LED strip that fits the aluminium profile can be used.
If you want to indicate the printer status using different light effects, you may use an addressable RGB LED strip. I used a WS2812B (60 LEDs/m), which is a 5V addressable RGB LED strip. However, I now believe it is better to use a 5V addressable RGBW LED strip, such as the SK6812, which could provide better white light.

The LED strip connection for WS2812B (5V)

Below, you can find an example of how to connect the addressable RGB LED strip to the mainboard and the power supply. It is necessary to use a step-down DC-DC converter to convert 24V to 5V. I used an LM2596 DC-DC module. The data input pin of the LED strip must be connected to the PC0 pin on the mainboard (see photo below).

The blocks diagram:

The wiring example:

The mainboard connector pin out:

The Klipper configuration example for WS2812B

Below, you can find an example of how to configure Klipper to use an addressable LED strip to indicate the printer status.

0. Install LED Effects for Klipper .

1. Create the led.cfg file in the Klipper configuration directory with the following content (see LED Effects for Klipper documentation for the details):

[neopixel rgb_panel]
pin: PC0
chain_count: 36
color_order: GRB
initial_RED: 1
initial_GREEN: 1
initial_BLUE: 1

[led_effect front_white]
autostart:              true
frame_rate:             24
leds:
    neopixel:rgb_panel (1-18)
layers:
    static  0 0 top (1.0, 1.0, 1.0)

[led_effect all_white]
autostart:              false
frame_rate:             24
leds:
    neopixel:rgb_panel
layers:
    static  0 0 top (1.0, 1.0 ,1.0)

[led_effect back_idle]
autostart:              true
frame_rate:             24
leds:
    neopixel:rgb_panel (19-36)
layers:
    breathing  10 1 top (0.5, 0.5, 1.0)

[led_effect back_heating]
autostart:              false
frame_rate:             24
leds:
    neopixel:rgb_panel (19-36)
layers:
    breathing  3 1 top (1.0, 0.18, 0.0)

[led_effect back_moving]
autostart:              false
frame_rate:             24
leds:
    neopixel:rgb_panel (19-36)
layers:
    breathing  3 1 top (0.0, 1.0, 0.0)

2. Include the led.cfg to your printer.cfg:

[include led.cfg]

3. Now you can add light status effects to your macros. 
Here is an example of the START_PRINT macro:

NOTE: DO NOT JUST COPY/PASTE THIS! IT IS ONLY AN EXAMPLE!

[gcode_macro _LED_HEATING]
gcode:
    STOP_LED_EFFECTS
    SET_LED_EFFECT EFFECT=front_white
    SET_LED_EFFECT EFFECT=back_heating

[gcode_macro _LED_PRINTING]
gcode:
    STOP_LED_EFFECTS
    SET_LED_EFFECT EFFECT=all_white

[gcode_macro _LED_IDLE]
gcode:
    STOP_LED_EFFECTS
    SET_LED_EFFECT EFFECT=front_white
    SET_LED_EFFECT EFFECT=back_idle

[gcode_macro _LED_MOVING]
gcode:
    STOP_LED_EFFECTS
    SET_LED_EFFECT EFFECT=front_white
    SET_LED_EFFECT EFFECT=back_moving
    

[gcode_macro START_PRINT]          ; START_PRINT 
gcode:
    {% set BED_TEMP = params.BED_TEMP|default(60)|float %}
    {% set EXTRUDER_TEMP = params.EXTRUDER_TEMP|default(210)|float %}

    BED_MESH_PROFILE LOAD=default
    BED_MESH_OUTPUT

    _LED_HEATING ; <====== The back LED strip will be blinking red.

    RESPOND TYPE=echo MSG="Heating bed({BED_TEMP}) and extruder({EXTRUDER_TEMP})"

    M140 S{BED_TEMP} ; Set bed temperature
    M104 S{EXTRUDER_TEMP} ; Set Hotend temperature

    M190 S{BED_TEMP} ;  Wait for bed to reach temperature
    M109 S{EXTRUDER_TEMP} ; Wait for Hotend Temperature

    _LED_MOVING ; <====== The back LED strip will be blinking green.

    G92 E0 ; Reset Extruder
    G90 ; Absolute Coords
    G28 ; Home all axes

    RESPOND TYPE=echo MSG="Bed mesh calibrate"

    BED_MESH_CLEAR
    BED_MESH_CALIBRATE PROFILE=adaptive_profile ADAPTIVE=1 ; Adaptive Meshes https://www.klipper3d.org/Bed_Mesh.html#adaptive-meshes
    BED_MESH_OUTPUT

    _NOZZLE_WIPE

    _LED_PRINTING ; <===== Both LED strips will be lighting up white.

    RESPOND TYPE=echo MSG="Start printing"

    G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
    G1 X0 Y20 Z0.3 F5000.0 ; Move to start position
    G1 X0 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
    G1 X0 Y200.0 Z0.3 F5000.0 ; Move to side a little
    G1 X0 Y20 Z0.3 F1500.0 E30 ; Draw the second line
    G92 E0 ; Reset Extruder
    G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
    G1 X0 Y10 Z0.3 F5000.0 ; Move over to prevent blob squish

The original model (https://www.printables.com/model/3267-led-light-bar-prusa-i3-mk2mk3) has been reworked to fit the Ender 3 V3 SE. The mounts were taken from https://www.printables.com/model/590337-ender-3-v3-creality-light-bar-retrofit.