A surgical instrument system comprising a first motor, a second motor, and a third motor is disclosed. The surgical instrument system comprises a first handle comprising a first number of controls, a second handle comprising a second number of controls, and a shaft assembly. The shaft assembly is attachable to the first handle in a first orientation in order to engage one of the motors. The shaft assembly is attachable to the second handle in a second orientation to engage a different motor. The surgical instrument system is configured to perform a different function of an end effector in the first orientation and the second orientation.