I have made some living hinges with Biome3D filament which is more flexible, and they work fine for hundreds of bends.
So not the amount you get with injection molding, but still nice enough to be useful for many things and if it breaks you simply reprint it. It opens up a lot of possibilities.
The standard swatches I print to show my clients the range of filaments I offer all include a living hinge. Flexible materials are best for this, woodfill is worst..

I am very interested to see the polyflex hinge.