Coupling... parts for 6mm & 8mm axles and soft & hard center part designs. I used my own TPU filament for the center parts.
http://rubber3dprinting.com/
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Coupling with flexible center part
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Creative Commons Attribution-NoDerivatives
You can download, share, and use commercially, but you cannot change the material in any way or use it to make something new.
Licensed under CC BY-ND
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