This is an awesome little NEMA17 stepper motor. It is the primary motor used on the Cupcake CNC. It has good torque and a small size. Here are some of the specs:

*Please note: This is a custom motor specifically designed to work with the CupCake CNC. The shaft length, shaft diameter and torque specifications are unique to our product.

• Part Number: Kysan Electronics / 1123029


• 200 steps per revolution (1.8 deg/step)


• 0.4A / phase


• Phase Resistance: 35ohm


• Phase inductance: 44mH


• Holding torque: 260mM*m


• Shaft diameter: 4.78mm / 0.188" (3/16")


• Shaft length: 24mm


• Motor depth: 34mm

This motor was custom made for the MakerBot design and has a few really nice features to make it easy to use for MakerBot or your own project.

1. Pre-assembled connector that is compatible with both the Stepper Driver v1.x and v2.x boards that we sell. Plug and play!

2. Extra long 460mm / 18" lead wires. No splicing, no soldering.

3. Extra long 24mm shaft. Size does matter.

NEMA-17 is a standard motor mounting geometry. The outside of the motor housing is 1.7"x1.7".

The specification datasheet is located in the MakerBot subversion respository.