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This stuff is pretty popular, makes your eyes red (mine too), and should be legal already!!!
I mean you know... there are plenty of good arguments about that,
Print this with a semi transparent material for best result! Chose your colour and you can scale it to best suit your need, weather you want to hang it in the windshield, in your office window, desk, you know.. earrings, you name it ! Lithophanes are based on the light passing through ''thick & thin'' material to make a ''dark & bright'' image. So you need to look at it towards the light. I've developed this technique of transforming images into 3D relief for lithophane magic! We can arrange for personalized portraits or whatever image you can send by email, now I can generate the 3D relief and edit to make it a solid of any shape, ready for 3D printing. Your custom lithophane picture could be the shape of a heart for example, or whatever shape you think of! Contact me http://www.bdanconcepts.com/contact-us