Neptune3 Pro E Axis Drop In Extruder Motor Replacement For Neptune3 Pro And Neptune3 Plus Hotend Nema 17 Bipolar 42 By 25mm Brass Teeth With Integrated Wire Easy Install Not Tested On Neptune3 Max Or Neptune4 Series FYSETC

Drop-In E Axis Stepper Motor for Pro/Plus Hotend (Single)
✔️ Fits 42x42x25mm, 1.5A, 17-tooth brass gear, 90mm lead

This bipolar NEMA 17 stepper motor is designed as a drop-in extrusion drive for compatible 3D printers. It delivers strong torque and smooth motion for reliable extrusion performance in DIY and upgrade projects.

✅ Motor Type: Bipolar stepper, frame 42 x 42 mm (1.65 x 1.65 in)
✅ Step Angle: 1.8 deg (200 steps per revolution)
✅ Holding Torque: 60 N cm
✅ Rated Current/Phase: 2.1 A
✅ Phase Resistance: 1.7 ohms
✅ Inductance: 3.1 mH +/-20% (1 kHz)
✅ Lead Length: 90 mm (3.54 in)
✅ Shaft Diameter: 5 mm; Shaft Length: 24 mm; D-cut Length: 15 mm
✅ Weight: 157 g
✅ Wiring: Black A+, Green A-, Red B+, Blue B-
✅ Warning: Some systems swap middle wires; fix by swapping the white nubs
✅ Drive: Requires constant current or chopper driver to test safely

💡 What is a bipolar stepper motor used for in 3D printers? This common setup is handy for precise extrusion control and reliable motion in the printer's E axis.

- It provides accurate torque for steady, crisp extrusion - Works with standard drivers when the wiring matches the A and B phases - Needs a constant current or chopper drive to avoid motor damage