LGX Lite V2 Large Gears eXtruder

Description

he 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.

To lower our ecological impact we are reducing our use of chemical dyes. This part is supplied with a wax protective coating to lower sensitivity to moisture and grease, while remaining fully functional.

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, …