MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
The reason for this is that you need 2 steppers for the Z Axis.
X-Axis = 1 Driver, 1 Stepper
Y-Axis = 1 Driver, 1 Stepper
Z-Axis = 1 Driver, 2 Stepper
Extruder = 1 Driver, 1 Stepper