Bondtech LGX™ For Flexibles Print Head Set

$219.00

Free shipping in Canada for orders over $140 before tax. (via Canada Post)

Master All Materials * Excel With Flexibles

The LGX™ FF Print Head is a special unit that includes the LGX™ Large Gears eXtruder and the LGX™ FF short filament path hotend based on Copperhead, that will master all materials and excel with the soft and flexible. All items in the LGX extruder and the LGX for flexibles set are included.

Designed To Be Flexible
The LGX™ For Flexibles Set includes a reversible heat sink that can be installed on the left or right hand side of the cold block. The heat sink also includes the hole pattern for attaching 40×40 fans.

Cooling down the heat break
Our tests suggest a 4010 fan is enough to cool down the cold block and the cold zone of the heat break, even with such small contact surface to the heat sink.

In case you have an application where additional cooling is required, try using a 4020 fan or 2 LGX heat sinks, one on each side.

Main Advantages

Gives access to all available materials.
Enables to print flexible and soft materials faster.
It is small and light.
Allows mounting in many different ways.

Technical Specification
LGX™ EXTRUDER

e-steps value : 400 using 16 microsteps; 800 using 32 microsteps.
Drive wheels : hardened steel;
Materials compatibility : abrasive; rigid; semi-flexible; flexible; and soft.
Mounting holes : M3
Mounting patterns : bottom anterior (2 points); left (2 points), right (2 points), front (4 points), back (4 points)
Holes on the sides of the LGX™ : 5 mm depth
Holes on the bottom of the LGX™ : 12 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 / 400 rotation_distance = 8

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 is 400.

PTFE tube lengths:

Old Mosquito/Mosquito Magnum : 10 mm
New Mosquito/Mosquito Magnum : 11 mm
Copperhead screw mount : 30 mm
PTFE tube should be cut straight on both ends.
Slight chamfer inside is recommended, but not mandatory.

retraction speed : 35 mm/s
retraction distance (bowden) : ~5 mm (0.4 + tube length x 0.15)
retraction distance (direct drive) for rigid materials : 0.4 mm
retraction distance (direct drive) for soft materials : 3 mm
Max Environment operating temperature : 70°C
LGX™ DD net weight : 218.6 g
LGX™ B net weight : 224 g
Package measurements : 80x103x73 mm
Package weight : 269 g
Download the LGX Technical Drawings here.

LDO STEPPER MOTOR FOR BONDTECH LGX™
PH-06AWJ connector

2 phases
DC 5.5 V
Max 1.0A/phase
To 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.

Class B motor, rated up to 130°C

Max recommended environment : 70°C
Max temperature at this environment temperature can go up to 130°C on account of the self heating.

Download the stepper motor Technical Data Sheet 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, ...

LGX™ FF SET