Arduino uno stepper motor limit

I am trying to use a ULN2003 stepper motor controller and I was wondering how to add two more so I could make a small 3d printer.

Find some that are MOSFET based instead, will run much more efficiently. Look at www.pololu.com

Would the motors that can be controlled by a ULN2003 have enough torque for a 3D printer.

Most small 3D printers use bipolar stepper motors with drivers such as the Pololu A4988

There is a simple system for a crude estimate of torque in Stepper Motor Basics

...R