Lead wires & cables: Special lengths, Protective hose
Shaft: Round, D-Cut, Cross drilled, Key-Way, Thread or Hollow
Winding: Resistance, Inductance, Rated Current, etc.
This is one of the most popular stepper motor in Nema 17 size, it with 1.8deg step and size 42x42x40mm, It has 4 wires with 1m cable and 2.54mm pitch connector, each phase draws 2.0A, with holding torque 45Ncm (64oz.in). This stepper motor is ideal for the RepRap Prusa, Mendel 90, Rostock and similar 3D printers, as well as CNC and robotics applications. Nema 17 datasheet is as the below.
Here is the updated version with a pluggable lead wire and smaller body. It's more suitable for your 3D printers: 17HS15-1504S-X1