Bondtech LGX Shortcut Mosquito For Prusa MK3S

The hot block included in this product is compatible with the RepRap standard of nozzles. Below is a list of compatible versions.
Click each link to open the related product page.

 

Technical Specification

LGX™ EXTRUDER

• e-steps value : 400 using 16 microsteps;
• Drive wheels : hardened steel;

• retraction speed : 35 mm/s
• retraction distance (direct drive) for rigid materials : 0.4 mm
• retraction distance (direct drive) for soft materials : 3 mm

• Max operating temperature : 70°C

• Max tightening torque on the extruder screws is 0.3 Nm
• Max tightening torque on the heatsink/cold block screw is 0.6 Nm

• LGX™ DD net weight : 218.6 g
• Package measurements : 80x103x73 mm
• Package weight : 269 g

CUSTOM STEPPER MOTOR FOR BONDTECH LGX™

• Requires cable with PHR-6 connector
• 2 phases
• DC 3.1 V
• Max 0.7A / 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 H motor, rated up to 180°C
  • Max recommended environment : 70°C
  • Max temperature at this environment temperature can go up to 130°C on account of the self heating.

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, ...

 

Before installing this upgrade kit you need to remove the whole printhead carriage and save all cabled items to re-use them later

 

01 – Preparing the LGX – 01:09

02 – Setting up the LGX Shortcut Printhead – 05:29

Video shows a LGX Shortcut Copperhead.
When using the LGX Shortcut Mosquito, insert the heater and thermistor from the left hand side (while facing the LGX front).

 

03 – Assembling The Mounting Accessories – 03:43

04 – Pre-mounting Assembly – 04:45

05 – Mounting The LGX FF On The Prusa i3 – 07:45

06 – Finishing The Installation – 03:07