Hopper.

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"Hopper" is a 3D-printed mechanism that propels itself upward using two springs. The "mass" - consisting of a motor, motor holder, switch, battery, gears, axle, and cams - first compresses the springs before releasing them to propel the mass upward to an abrupt stop, causing Hopper to hop. Modeled after classic windup and battery-powered hopping toys from my childhood, Hopper was designed to demonstrate the difference between potential energy (stored in the springs via the battery, motor, motor holder, switch, gears, axle, and cams) and kinetic energy (released from the springs and resulting velocity of the battery, motor, motor holder, switch, gears, axle, and cams), while entertaining my grandkids. As usual, I likely forgot a file or two, so feel free to ask questions if you need clarification. Mistakes are inevitable, but your feedback is always welcome. Hopper was designed using Autodesk Fusion 360 and sliced with Cura 4.3.0 before being printed in PLA on an Ultimaker 3 Extended and an Ultimaker S5. Finally, please note that I receive no compensation for the design, equipment, parts, or materials used in this model, nor do I expect any form of payment or recognition.