Prusa Accessory - Extruder Stepper Motor Replacement - Small Stepping Motor 42-20: 2 Phases 1A 1.8 Degrees 0.19 N.M with Integrated Cable for MK4S XL 3.9 3D Printer E Axis

Prusa MK4S E-Axis 42-20 Stepper Motor with Integrated Cable
✔️ 2-phase 1A, 1.8° step, 0.19 N m torque, integrated 60 mm cable

This compact extruder stepper motor is a drop-in replacement for the E-axis on MK4 Prusa XL printers, delivering reliable, precise extrusion for hobbyist and professional 3D printing projects.

✅ Size: 42x42x20 mm (1.65x1.65x0.82 in), 5 mm shaft, D-shaped
✅ Type: NEMA 17 bipolar two-phase with 1A rated current and solid holding torque
✅ Step angle: 1.8 degrees for fine extrusion control
✅ Torque: holding torque ≥0.19 N m, stable output with low noise
✅ Cable: integrated 60 mm wire with 4-pin MX connector
✅ Compatibility: MK4 Prusa XL MK3.9 E-axis only, not X/Y axes
✅ Package: 1 piece

💡 What is an extruder stepper motor used for in a 3D printer?

The extruder motor drives the filament forward, providing precise control of material flow for consistent prints.

- extruder motor powers filament feed with precise step control - helps prevent under- or over-extrusion by maintaining accurate feed - integrated wiring simplifies installation on MK4S E-axis - ideal upgrade for Prusa MK4/MK4S XL systems to improve reliability