Cool !
I discovered recently a plastic called UHMWPE (Spectra brand for instance) that will be perfect for this kind of application.
This plastic is super strong, abrasion resistant, self lubricating and it has other nice properties.
There are mono filament fish-lines made of this material that can replace strings (stronger than steel).
However I did not yet found a filament for 3D Printers, even if pellets are not so expensive.
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Sounds nice. I will check it out. I have used fishlines as string on my later versions, but just normal nylon ones.