LDO Motors LDO-42STH40-1684AC(RSS9T) 9 Tooth Nema17 Motor

CoreXY and Voron builders understand that precise and reliable stepper motors are essential to avoid layer shifting and maintain print accuracy — a weak or incompatible motor can cause missed steps and print failures.

The LDO Motors LDO-42STH40-1684AC(RSS9T) is a NEMA 17 stepper motor with a 1.8° step angle and 200 steps per revolution, delivering 4.5Kgf cm holding torque. This 40mm body motor with a 9-tooth 24mm output shaft is commonly used in high-performance DIY builds like the Galileo G2Z XL and Voron 350mm Z-axis assemblies. Its 1.68A phase current ensures smooth, precise motion control, making it ideal for CoreXY and Klipper-based printers requiring consistent layer alignment.

Why Upgrade?

• Ensures precise Z-axis movement in Voron 2.4 and Galileo G2Z XL builds, reducing layer shifts.
• Delivers consistent torque for CoreXY and Klipper printers requiring reliable stepper performance.
• Improves print quality by maintaining accurate step resolution and smooth motion.
• Compatible with high-end DIY builds needing a robust 9-tooth NEMA 17 motor for Z-axis or other axes.

Best For:

• Voron 2.4 and Trident builders upgrading their Z-axis motors for improved reliability.
• Galileo G2Z XL users replacing or upgrading their stock stepper motors.
• CoreXY and Klipper ecosystem enthusiasts requiring precise stepper control.
• DIY 3D printer builders needing a high-torque, 9-tooth NEMA 17 motor.

Pair With the Right Filament

Reliable stepper motors like this LDO model ensure consistent extrusion and layer alignment, which is critical when printing with demanding filaments.

• PLA Filament — ideal for everyday prints requiring smooth motion and accuracy.
• PETG Filament — benefits from stable stepper performance to avoid stringing and layer issues.
• TPU Flexible Filament — precise motor control helps manage flexible filament extrusion.