I designed the tessellating pattern long before I got into 3D printing and once I saw you could get heat reactive filament I thought it would be a neat idea to make a coaster that changed colour. The reason the petals are inlaid is because you need to use a plastic glue to ensure that the ABS and PLA stick together. I have found ABS doesn’t like to stick to anything much, particularly cold surfaces. I also wanted the challenge of making two models that had to fit together.
The heat reactive filament is interesting because for ABS it has to be a high temperature but too high and you can cook the dye.
I printed it in my Ordbot and I used Blender to make it. I’ve had people buy these so I am quite happy with it:-)



