Now, the focus was on finding the most efficient design. While we were able to freely manipulate how the shape of the collected wax would look like, we needed to ensure that all of it would be combusted.
Many designs were considered. In the end, we settled on a plate as the shape of the vessel. While the vessel needs to be affordable, it cannot be made of plastic, as the flame would eventually burn through the plastic, possibly spreading to nearby flammable materials. As such, fire-insulating materials, such as porcelain or clay, would be used to ensure that the flame is contained within the vessel. Also, the shape of the plate helps to ensure that the wax can be burnt evenly, similar to the concept of oil lamps.