Constantinescu Torque Converter
thingiverse
You can find a video on this at https://youtu.be/QD2fJskamuUto finish this you will need 24 x 10mm ball bearings and two bearings 12mmOD, 6mmID, and 4mm thickThe case sides are long and you may have to split them for smaller printers - just do half and half and glue them together
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