We have a great assortment of stepper motors for both 3D printers as well as CNC machines. Most printers use NEMA17 motors, where most importantly you have to select the torque. Except for the NEMA23 steppers all our normal Pololu style stepper drivers will work fine. For the NEMA23 stepper motors we recommend using a SDTB6600 or SL2690A.