These coasters were made using the app Fluid Designer for 3D Printing (with Blender) and Voronoi Patterns. The Voronoi Patterns come as round, hexagonal and rectangular. Because they are parametric smart objects they can be scaled easily to make a range of items.
If you want to purchase the Voronoi Patterns used to make these items click here – Voronoi Patterns.
If you want to see how easy it is to create these objects watch the video below.