Oldham Coupler
thingiverse
I've created a replica of an Oldham Coupling. The Wikipedia page on Couplings lists the Oldham type: https://en.wikipedia.org/wiki/Coupling#Oldham. If you choose to utilize the joints at machine tolerances, they're ready to go. Otherwise, all sliding and rotating joints will demand sanding for smooth performance.
Download Model from thingiverse
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