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Bondtech LGX® Lite Large Gears Extruder

Bondtech LGX® Lite Large Gears Extruder

$114.50 AUD$129.50 AUD +GST

Bondtech’s LGX Lite extruder is based on the LGX with the same large gears with an ultra compact and lighter weight package.

Available with and without motor.

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Description

The Bondtech LGX® Lite is a filament feeder based on the LGX® Large Gears eXtruder and uses Bondtech’s new Dual Drive Technology based on larger drive gears.

Each LGX® Lite extruder is supplied with:

  • 1x LGX® Lite feeder;
  • 1x LDO Nema14 Round 20mm pancake stepper motor;
    • 1m long lead cable
    • with JST-XH 4-pin connector
  • 1x 2mm Hex Key (recommended tool);
  • 1x Powered By Bondtech sticker.

Also shipping with additional accessories:

  • 1x Push-fit collar
  • 1x 30mm PTFE tube to use in the PTFE Tube Adapter.
  • 8x M3 square nuts for reinforcing mounting holes.

8 features of this Bondtech eXtruder:

  • Larger drive wheels, for increased filament grip;
  • Filament pre-tension lever, for repeated results;
  • Drive wheels’ maintenance windows, for easy cleaning;
  • Compact, light & centered filament path, for increased performance and compatibility;
  • Multiple mounting hole patterns, for easy and flexible setup;
  • Compatible with Nema14 round stepper motors;
  • Craft boxes without bleaching & no coating.
  • Nylon housing with no dyeing or other chemical post processing.

3D Printed Housing using PA12

The housing parts are professionally printed with polyamide 12 for maximum strength, precision and higher temperature resistance.

Additional information

Weight 0.31 kg
Motor:

With Motor, Without Motor

Technical Specification

LGX® LITE EXTRUDER
  • e-steps value : 562 using 16 microsteps; 1124 using 32 microsteps.
  • Drive wheels : hardened steel;
  • Materials compatibility : abrasive; rigid; semi-flexible; flexible; and soft.
  • Mounting holes : M3
  • Mounting patterns : bottom (4 points); right (2 points), front to motor (2 points), top (1 point)
  • Hole at the top of the LGX® Lite : 5 mm depth
  • Holes on the side of the LGX® Lite : 5 mm depth
  • Holes on the bottom of the LGX® Lite : 5 mm depth
  • Max tightening torque on the extruder screws is 0.3 Nm

For Klipper users

rotation_distance = full_steps_per_rotation * microsteps / steps_per_mm

rotation_distance = 200 * 16 / 562
rotation_distance = 5.7

The above calculation assumes the following parameters:

  • stepper motor is a 1.8 degrees motor hence 200 as full steps per rotation;
  • microsteps are set to 16;
  • e-steps value recommended for the LGX® Lite is 562.
  • retraction speed : 35 mm/s
  • retraction distance (bowden) : ~5 mm (0.4 + tube length[mm] x 0.015)
  • retraction distance (direct drive) for rigid materials : 0.4 mm
  • retraction distance (direct drive) for soft materials : 3 mm
  • Max Environment operating temperature : 90°C
  • Max stepper motor running temperature : 120℃ / 750 mA
  • LGX® Lite net weight : 48 g
  • LGX® Lite with motor net weight : 141 g
  • Package measurements : 80x103x73 mm
  • Package weight : 85 or 185 g
CUSTOM STEPPER MOTOR FOR BONDTECH LGX
  • Connector: JST-XH 4-pin connector
  • Motor gear : 10 teeth
  • Motor length: 20 mm
  • Motor Diameter: 36mm
  • Weight : 93g
  • Max Current : 1.0 A / phaseTo use the LGX, run the stepper motor with currents between ~0.45 and ~0.65A:

    Be vigilant regarding the stepper motor surface temperature.
    Keep it cool enough to touch. Lower Vref otherwise.

  • Leads Length : 1m
  • Step Angle : 1.8 degree
  • Max Torque at : 1800 PPS
  • Potential Flow Rate @ Max Torque : 120mm^3/s
  • Class: H, rated peak temp 180℃
  • Max operating Temperature / Current :
    120℃ / 750 mA
  • Manufacturer : LDO
  • Manufacturer SKU : LDO-36STH20-1004AHG(XH)
  • Check for more infor here.

How to change the Current using Vref

It is very hard to read the current being fed to stepper motors. To determine that current we rely on the Vref value. The Vref value is a voltage reference measured in VDC that can be read using a multimeter. It helps us setting the current output of the stepper motor driver.

Different 3D printer mainboards use different stepper motor drivers. Each type of stepper motor drivers has its own formula to calculate the required Vref to get a specific current. Here are some examples:

  • TMC stepper drivers.
    The formula for these drivers is Vref = ( I * 2.5 ) / Imax
    Where I is the target current value measured in A; and Imax is 1.77 on regular mode and 1.2 on SilentStepSticks mode.
  • Pololu A4998.
    The formula for these drivers is Vref = I * 8 * R
    Where I is the target current value measured in A; and R is the Sense Resistor value, that depends on what board are you using. Melzis use 0.1,the Creality Silent boards use 0.15, …

Mounting Patterns & Information

Extruder and Stepper Motor go together

Preferably, you should always use the extruder attached to the stepper motor when you mount it on a printer.

If you need to put a plate in between the stepper motor and the extruder please notice the max supported thickness is 3mm.

To use a plate in between the stepper motor and the extruder, you need to replace the stock rear plate of the extruder with the printer’s plate (thicknesses between 2 and 3mm).
Don’t use a plate in between without removing the rear plate.

MULTIPLE MOUNT PATTERNS

The LGX® Lite features 4 mounting patterns:

  1. 4 holes at the bottom;
  2. 2 holes at the right hand side;
  3. 1 hole at the top plus the filament entry that may be used as anchor.
  4. 2 holes across, to hold the stepper motor

All except frontal mounting holes on the LGX® Lite require to place a M3 square nut inside the housing to act as reinforcement. The holes with square nuts are M3 thread and 5 mm deep (till bottom of the square nut).

STEP Files To Download

Click the button below to download the STEP file

Download STEP file

Addressing A Hot Stepper Motor

To use the LGX® or LGX® Literun the stepper motor with currents between ~0.45 and ~0.65A.

This current interval is just a recommendation and it should be optimal to keep the stepper motor running with enough torque and low enough surface temperature.

Be vigilant regarding the stepper motor surface temperature.
Keep it cool enough to touch. Lower the current otherwise.

If the stepper motor is cool and loosing steps you need more torque.
In this case increase the current.

To adjust the LGX’s stepper motor current use one of the following methods:

Change the current using Vref on a multimeter

It is very hard to read the current being fed to stepper motors. To determine that current we rely on the Vref value. The Vref value is a voltage reference measured in VDC that can be read using a multimeter. It helps us setting the current output of the stepper motor driver.

Different 3D printer mainboards use different stepper motor drivers. Each type of stepper motor drivers has its own formula to calculate the required Vref to get a specific current.

Lowering current on Ender-6

You can learn how to adjust the Vref by watching the video or by following this guide as example:

Current adjustment on Creality units

Change the current without a multimeter

If your printer doesn’t have DigiPOTs, and in case you don’t have a multimeter to visualize the Vref you may still adjust the current fed to the LGX stepper motor by trial and error.

Use the analog potentiometer (inside yellow ring)next to the extruder’s stepper motor driver (below the heatsink inside the red ring), and turn the potentiometer a few degrees at a time.

Rotate it counter clockwise to lower the current, or clockwise to increase it.

Between each iteration, use the printer and check if the stepper motor is not getting hot neither it is loosing steps.

Lower current if stepper motor is too hot to touch.

Increase current if stepper motor is loosing steps.

Change the current using DigiPOTs

DigiPOTs are digital potentiometers which resistance can be varied by digital communication instead of turning a knob, like seen above.

On a 3D printer with a mainboard carrying DigiPOTs, you may use the user interface of the unit (if that feature is available) or even Gcode commands to set the current of the different stepper motors.

On RepRap units with DigiPOTs, the M906 command may be used to change the Extruder stepper motor current M906 Ennn, where nnn is the amount of milliamps desired.

Marlin also uses a similar command. M906 Ennn sets the current on TMC drivers. On stepper motors with other drivers and DigiPOTs, you may also set the current in milliamps using the command M907 Ennn

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