There are two stepper motor available for the OmniaDrop extruder.

The 1.75 mm OmniaDrop comes standard with a small stepper motor, the 3 mm OmniaDrop comes standard with a big stepper motor.

The bigger stepper motor has more torque but also weighs 90 gr. more. 

Specifications of the Stepper Motors:

1.75 mm Nema 17 stepper motor

Body length: 20mm

Weight: 140 gr.

Motor Type: Bipolar Stepper

Step Angle: 1.8 deg

Holding Torque: 13 Ncm (18.4 oz.in)

Rated Current/phase: 1.0A

Voltage: 3.5V

Phase Resistance: 3.5ohms

Inductance: 4.5mH ± 20%(1KHz)

3 mm Nema 17 stepper motor

Body length: 34mm Weight: 230 gr.

Motor Type: Bipolar Stepper

Step Angle: 1.8 deg

Holding Torque: 22Ncm(31oz.in)

Rated Current/phase: 1.33A

Voltage: 2.8V

Phase Resistance: 2.1ohms

Inductance: 2.5mH ± 20%(1KHz)