"I was impressed enough with the PLA Spring Motor Demonstrator test to attempt to design, 3D-print, and assemble a variety of wind-up vehicles, including a wind-up car, wind-up bunnies, wind-up helicopters, and more."
"I recently decided to revisit the original PLA Spring Motor Demonstrator design, using Autodesk Fusion 360, and the PLA Spring Motor Demonstrator II is the result."
"The design incorporates the use of Fusion 360 ‘parameters’, allowing me to alter sizes and clearances between the gears, axles, and axle mounting holes, with ease. As a result of this update, it will be much easier to design and print PLA Spring Motor-based models."
If you fancy making your own spring motor, Greg has shared instructions to make it, including the design files at www.instructables.com/id/PLA-Spring-Motor-Demonstrator-2/. For lots more designs, check out Greg's YouTube channel.