PICtart 1s. Refreshed UI! UPtart supported! It is easiest way to make your own lithophane data for your 3D printer. It provides frames(we call it tart), so choose and place your PICture, you can make your lithophane easily. (PIC + tart = PICtart! ). You can not use the data produced by this app and can not use tart designs to commercial. (3D data, 3D printing Outputs, etc).