Looking into stepper motors on Stepperonline and am following Skyentifics parts list. Find him on Github here.
Here he is using low amperage steppers which have high holding torques. At first I was confused as when looking on stepper online I came across stepper motors rated at 2 Amps where as he was using steppers with in the range of 0.5 amps to 1 amp with the same holding torque. So I contacted the customer support and the friendly guy explained that inside the stepper motor with the lower amperage had bigger stator coils that required less amperage to produce the same holding torque. He also mentioned the lower amp stepper would run cooler which would be better for my application as PLA ( 3d printer filament ) starts to soften at around 60 degrees celsius. Below is a picture of a stepper motor internals to help you understand where the stator coils are.