Geometric Trivet

After I created the Geometric Ornament in OpenSCAD http://www.thingiverse.com/thing:298373, I thought it would make a nice trivet and decided to use Shapeways to print one in ceramic. It turns out that the design rules for ceramic printing are very restrictive compared to printing in PLA. There are rules about the overall size and the minimum and maximum wall thicknesses. This has to do with the sintering process that is required to finish the ceramic. It took several iterations with Shapeways b