What is the purpose of adding filler in a metallographic mounting machine Why is the upper mold pressed onto the filler?

In the metallographic mounting machine, the main role of adding fillers is to support and protect the sample. Fillers can make the sample parallel to the lower platform, ensuring the stability and integrity of the sample during the sampling process. Pressing the upper mold onto the filler is to fix the sample and the filler, preventing movement or deformation during the operation. This can ensure the accuracy and reliability of sampling, providing accurate basic data for subsequent metallographic analysis.