3D-Printed Roller Coaster
There are LEGO sets for just about everything, but you’ll be hard pressed to find one for a roller coaster, much less one that is fully powered with simulated physics. So, inventor Jon Mendenhall decided to make his own using a 3D printer and a few other parts that you can easily find online. The end result is something that any theme park aficionado would want to showcase.

The track took around 400-hours to 3D print, while the brushless DC motor-powered cart ensures that it simulates a real roller coaster using a rack-and-pinion system and lithium-ion battery. To receive commands via WiFi, it uses an ESP32 to drive the motor, which is connected to a Raspberry Pi computer that runs the cart through a preset sequence.

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