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3d printed nut?
(lemmy.ca)
Dedicated to the craft of lutherie, the making of string instruments, and all those who practice it, admire it, or wish to learn about it.
3D prints rarely fail in compression, so I suspect you'll likely be fine. You can probably get away without glueing it down, so even if they have a finite life you could replace them as needed.
You will likely want something that's on the durable side of the spectrum, vs hard and brittle. IMO best to worst: ASA/ABS, PETG, PLA+, PLA.