This is the NEMA 17 stepper motor used in most Flashforge 3D printers. They can be found in the extruders, and at the ends of most axis controlling movement. These motors are common to most 3D printers and can be used with printers of most brands, however it is worth noting that this is the type of stepper motor with a 6 pin plug on the end.
Specifications-
Download full specifications -here-