Thingiverse
Fresnel Collimator?
von pauljs75
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Attempt at a lens based on a squashed sphere, then manually sliced as a rudimentary Fresnel lens arrangement. To get this close to optically clear, the 3D print would be used as the basis for making a silicon release mold, and the actual lens cast in resin. Well, now that the suggestion is there, I suppose figuring out the rest is up to you.
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