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Everyone is familiar with the old style of nerd glasses repair. White tape on the bridge of the nose.
But in the future I imagine that if you break such a thing the best thing to fix it might be to simply print out a new frame.
This is my vision of how home fabbing may be useful in the near future. These frames are based on measurements I made of a pair of sunglasses and have a groove where you might be able to slip in your existing lenses until you can arrange a more permanent solution.
Given the way Fab@home experiments have been going I imagine that the better solution may be to have the machine print to this point, then stop it, and place the lenses in the base, and have the machine resume printing the frames around them.
I'm not familiar with the usual cost of eyeglass frames, but at $12. these indicate that printed frames could potentially be cheaper than some that you buy at an optometrist of frame shop. And printed frames may someday be available in much greater variety, and you also have to option of designing your own.