Hidden Lithophane Loonie Shopping Cart Tokens

thingiverse

These are Loonie-shaped shopping cart tokens with hidden internal lithophanes that remain invisible unless viewed with a bright background light. I've also created One Euro tokens here: https://www.thingiverse.com/thing:2824141. Multiple models are included, each featuring a different picture for the lithophane. A solid token without a lithophane is also included, along with the OpenSCAD file used to generate them so you can create your own custom pictures or adapt the model for coin tokens in your country. For optimal results, use greyscale images with high contrast and some completely black pixels so that the top layer has areas to print directly on. The lithophane is only 1.2 mm tall, limiting detail visibility. Tokens with lithophanes must be printed at 100% infill for accurate rendering of the lithophane. A light-colored filament is required to allow light to pass through. Update: On February 15th, 2019 Three tokens made from SVG vector images were added, featuring an atom, a cannabis leaf, and a maple leaf. These vector images translate better to FDM 3D printing than bitmap images, producing smoother movements and smaller STL and G-code files.