With the rise of **3D printing technology**, once-unimaginable ideas are now becoming tangible. As a result, creative minds from around the world have embarked on exciting journeys of exploration, offering people a glimpse into a fascinating and open-minded universe.
Alex Crease, an engineer, musician, and adventurer, describes himself as someone who loves building things but also enjoys taking them apart to understand how they work. He co-founded Olin Engineering with three other students, managing their **3D printing** space. His passion for robotics led him to become a leader in the school’s **3D printing** community, constantly experimenting with new applications for **3D printers**.
While he's currently working on a revolutionary technique he calls "co-processing," which he updates weekly on his blog, this article focuses on something more playful: a simple yet clever robot called the **PulleyBot**.
The PulleyBot is a small single-actuator robot that moves using a belt and pulley system. The belt wraps around the pulley and is driven by friction, making it a great example of mechanical ingenuity.
To build your own PulleyBot, you'll need a few basic tools: a small screwdriver, wire stripper, 0.05" hex wrench, 3/32" hex wrench, solder and soldering iron, super glue, a hacksaw or band saw, a **3D printer**, and some grease.
Crease started by printing all the parts using a **MakerBot Replicator 2** at standard resolution, which took about 5 hours and 45 minutes without any support structures. When assembling the robot, he recommends applying a bit of grease or lubricant to the axles and axle holes to reduce internal friction and ensure smooth movement.
To determine the direction of motion, simply power up the motor and observe its rotation. A component called the **Large_Drum**, connected to the shaft, will rotate in the same direction as the motor.
Adjusting the speed is easy—just move the **O-ring** to a different groove on the pulley. If you want to go faster, place it on a larger-radius groove; for slower movement, switch it to a smaller one.
This simple robot not only demonstrates the potential of **3D printing** but also highlights the fun and creativity that can come from combining mechanical design with digital fabrication. Whether you're a hobbyist or a student, building a PulleyBot is a rewarding project that brings the future of engineering right into your hands.
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