This is my first functional 3d object. I am still learning how to use CAD software and it happened that I had these steel spheres in my hands and the first thing that came to mind was to design a ball bearing. The files in the downloads also include the single ball bearing but the dimensions are not standard.
Note: you will need 56 metal spheres of 5mm diameter to insert inside the gears. They could also be 3D printed but I have not tried to do so.
I hope you like it.
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