1、Product Includes: Replacement small stepper motor, no need any firmware to change, 1pcs stepper motor 42x40mm only, not come with a connecting cable. 2、Compatible with: Compatible with for Meg XYE axis or Vyperr Y axis 3D printer or other CNC machines. Please note: Not work for Kobra Extruder 3d or test on for Kobrra other axis. 3、Motor Specification: Motor is 2 phase, 1.8° step angle (accuracy ±9%), rated voltage 2.55V, current 1.5A/phase. Shaft length about 20mm/0.8in, diameter: 5mm/0.2in. 4、High Torsion: This 42‑40 stepper motor adopting premium motor steel material, is provided with high torsion (42Ncm(60oz.in) ), low self inductance reactance, responsive and can avoid system error. Low loss stators have better high speed performance. 5、Use Tips: We only test on for Anycubi Vype and for MegaSeries machine, have not applied on other printer models yet. So if you use on other printers, please make sure change the firmware.