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I have made one, using thin glass fibres from optical cable (not easy to find these days, modern fibres are mostly plastic and not thin enough).
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I terminate fibre cable all the time, believe me, it's not plastic nowdays, it's still made of glass.
Fibre cable comes in 2 types, loose tube and tight buffer. Both have a plastic coating which has to be carefully scraped off the fibre. The loose tube variant has a thin coating, the tight buffer has a double coating and is much thicker, but still the same diameter once stripped. I have a special stripping tool which does it, but they're over $100.
I suspect that the buffer could be removed from the loose tube variant with some solvent.
If anyone would like some short pieces of fibre, PM me out, I can supply for free, you supply a Stamped Self Addressed Envelope.