The Infinite Sand Castle This is my entry for the Build a Castle challenge! The main goal in designing these moulds was to show how tessellation can create complex patterns from simple shapes. I was inspired by the Islamic mosaics from the Alhambra and created a simplified pattern that could work as the floor plans for the sand castle. The moulds were modelled in Blender, sliced in Cura, and printed on a BQ Hephestos Prusa i3. https://www.youtube.com/watch?v=N37bd8Xsngs The moulds are already scaled correctly and can be printed in most 3D printers. It is important that the moulds are solid so that they will not break, so the this walls must be completely filled. You can either set the filling to 100% for the entire mould or increase the number of shells (or shell thickness) to ensure that no gaps are left between the thin walls. The layer height can be set quite high, since we're not looking for fine detail. The settings I used in Cura (for a 0.4mm nozzle) are the following: