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Redrex extruder upgrade kit
From the following page, an upgrade kit is offered, mainly containing a filament extruder motor with a gear reduction. The gear reduction would give the extruder more force to push the filament in.
The following information I was able to find:
Increase the E-step value to 400
1).
Extruder Frame Specifications:
Material: Injection molding plastic
Driving Gear Diameter: 12mm
Driven Gear Diameter: 8mm
Transmission Ratio: 3:1
Stepper Motor Specifications:
Motor Type: Bipolar Stepper
Number of Phase: 2
Step Angle: 1.8 deg.
Rate Voltage: DC 3.0V
Holding Torque:DC 1.2A
Phase Resistance: 2.5ohms ±10%(20℃)
Phase Inductance: 3.8mH ±20% (1KHz)
Rotor Inertia: 30.8g.cm²
Size: ±63*85*69mm
Weight: ±290g