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It takes 3 more transistors and a bit more space on the breadboard. Look up references to H-bridge to get the details. You'll be using another output pin on the Arduino, and an input pin to switch directions. Also have to be careful about changing directions when the motor is running--you might let the smoke out of your electronics. Also watch out for the polarity on your electrolytic caps--they're exciting when you violate them!
3D Printing Class
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