Sun cream ?
thingiverse
I designed this bracelet, to help make sure my kids use sun cream! Because they are very sensitive to the sun. I uses Photo Chromatic PLA, from http://3dfilaprint.com http://www.shop.3dfilaprint.com/pla-175mm-white-to-blue-ultra-violet-reactive-filament-568-p.asp which is sensitive to UV lite !! Instructions Nothing special, 2-3 perimeters, but be careful, there is a 'difficult to print' over hang, on the first 2 layers, I am working on that .. Slic3r did not do such a good job of my first print :(
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