This Stepper Motor is Discontinued Now, We recommend other best selling Stepper Motors as a suitable replacement.
A stepper motor with timing pulley, type name "17PM-K446-04VS". This motor has 1.8" stepping angle. And its rated voltage is only 4.6V, which could be used in the low-voltage environment. The static torque could arrive 3.92kg.cm. It has been enough for the most popular application. Wtih a timing pulley, you could connect a belt on the roller. Especially when you are going to play with a 3D printer. That will be a good choice.
This stepper motor is compatible with both the Overlord and Overlord Pro.