These 2 LED lamps are more alike than they seem. Both share the same basic deign as https://www.thingiverse.com/thing:3458067, but have rounded rather than square edges. The large one took 56 1/2 hours to print because it has a lot of non-visible internal structure that is a result of the many overlapping shells that comprise the geometry.
The overlapping shells are the result of the final geometry being created by double twisting a more basic shape, This blog page shows how to do a double twist: http://birkbinnard.com/blog/do-the-twist2/.
I made the small one because I figured no one would want to take the time to print the big one. The small one uses the exactly same basic geometry, but it is smaller and has only a single twist. I also increased the number of ribs so they would be in scale with the smaller size. This one printed in just under 17 hours.
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