Gyroscopic Exercise Ball
thingiverse
This is my take on the iconic Dyna Bee gyroscopic exercise ball that emerged in the late 1970s. It utilizes 48 pennies (US) as the flywheel mass. To give it a twist, I've integrated a geared zip starter to propel the rotor up to speed quickly. From there, you keep it spinning with pure wrist power. Apart from the 3D printed components, you will need a 0.125-inch diameter steel rod and some superglue to assemble it properly. UPDATE: I've revised the shell to make it easier to align the zip starter with the slots in the side. https://youtu.be/PxPEBXRKOyI
With this file you will be able to print Gyroscopic Exercise Ball with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Gyroscopic Exercise Ball.