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Gyroscopic Exercise Ball
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This is my take on the venerable Dyna Bee gyroscopic exercise ball that came out in the late 1970's. It uses 48 pennies (US) as the flywheel mass. As a twist, I've added a geared zip starter to get the rotor spinning up to speed. From there, you keep it going with pure wrist power.Aside from the 3D printed parts, you will need a 0.125" diameter steel rod and some superglue to put it together.UPDATE: I've modified the shell to make it easier to align the zip starter with the slots in the side.Print SettingsPrinter:UDIORafts: NoSupports:NoResolution: 0.2mmInfill:20% Notes: Print to two of the shell.STL, two of the rotor.STL, one of the ring.STL and one of the gear.STL. I've included two versions of the rack.STL (the zip starter) - one about 11" long and a shorter one about 7.5" long that should fit on a 250x250mm print bed. You will also need a 0.125" diameter steel shaft (available from most hardware stores) that is 2.465" long, and also 48 US pennies, preferably new.Post-PrintingAssemb
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