Introduction

LLL PLUS Buffer

The LLL PLUS buffer is a filament buffer for 3D printers developed by Mellow, designed to enhance the stability and print quality of 3D printing. This product is made from high-quality materials and incorporates advanced design concepts, offering features such as wear resistance and high-temperature tolerance, making it suitable for various types of 3D printers.

Using the LLL PLUS Buffer

The LLL PLUS filament buffer is a device specifically designed for remote filament feeding in 3D printers, aiming to simplify the process of loading and unloading filament. The buffer features two buttons, one for feeding and one for retracting, allowing users to perform electric filament feeding and retracting operations.

Buffering Function:

When the extruder of a 3D printer pulls filament, if the remote filament spool is tugged, the buffer detects this action and automatically feeds a segment of filament toward the hotend. Each time a tug occurs, the buffer repeats this filament feeding operation. This effectively reduces the pulling force exerted by the extruder on the filament, maintaining stable extrusion pressure, thereby improving the stability of print quality.

Runout Detection Function:

The buffer includes an integrated runout detector. When the buffer detects a lack of filament, it sends a signal to the 3D printer to pause printing. To utilize this feature, a signal pin must be connected and the 3D printer's configuration modified. However, the buffering function can be used directly without any configuration changes. With the above functional design, the LLL filament buffer not only simplifies filament handling but also enhances the stability and print quality of the 3D printing process.

• Please note that the filament must be properly inserted for the features to function; otherwise, only manual motor control via the buttons is possible.

Important Notes

• Before use, ensure that the buffer is correctly connected to the 3D printer and that the filament is properly loaded; otherwise, it will not function correctly.
• The feeding and retracting operations of the buffer can be controlled using the buttons, allowing users to operate as needed.
• If the runout detection function is required, a signal pin must be connected and the 3D printer's configuration modified.
• If only the buffering function is used, simply connect a 12V-24V power supply.

Button Instructions

• Firmware version: V1.0.3
  • Additional features added to existing functions:
  • Single press of the forward button: PA2 outputs a high level for 3 seconds.
  • Single press of the reverse button: PA3 outputs a low level for 3 seconds.
  • Double press any button: the buffer stops working; reloading, single pressing, or long pressing any button resumes buffer operation.

Configuration Reference

[filament_switch_sensor Runout Detection]
pause_on_runout: true
switch_pin: ^
runout_gcode:
        PAUSE
        M118 Out of filament
insert_gcode:
        M118 Filament loaded


#[gcode_button Feed]
#pin:^! # Replace with your own pin, connected to the feed pin
#press_gcode:
#    _feed

#[gcode_button Retract]
#pin:^! # Replace with your own pin, connected to the retract pin
#press_gcode:
#    _Material_return

[gcode_macro _feed]
description: feed
variable_clean_temp: 210       ; Extrusion temperature (℃)
gcode:
    RESPOND TYPE=echo MSG="The hotend will heat up to {clean_temp} degrees"
    M109 S{clean_temp} ; Set extrusion temperature
    M83 ; Relative extrusion mode
    G92 E0 ; Reset extrusion position
    G1 E50 F600 ; Extrusion distance
    RESPOND TYPE=echo MSG="Extrusion completed"

[gcode_macro _Material_return]
description: Material return
variable_clean_temp: 210       ; Extrusion temperature (℃)
variable_cool_temp: 0        ; Final temperature (℃)
gcode:
    RESPOND TYPE=echo MSG="The hotend will heat up to {clean_temp} degrees"
    M109 S{clean_temp} ; Set extrusion temperature
    M83 ; Relative extrusion mode
    G92 E0 ; Reset extrusion position
    G1 E-50 F600 ; Extrusion distance
    M109 S{cool_temp}
    RESPOND TYPE=echo MSG="The hotend will turn off"
    RESPOND TYPE=echo MSG="Extrusion completed"

Wiring Diagram

Installation Video

Installation Diagram

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