Rejections traced back to the shell room usually come from variation, not from a single bad batch. Slurry viscosity drifts through the day, drain times differ between operators, and stucco coverage on the back of a tree gets missed. The defect appears much later, after pouring. Laxminarayan Technologies approaches this as a process control problem. Secondary slurry mixers and trans... https://www.ic-machines.com/robotic-shell-building/Consistent Ceramic Shells: Investment Casting Shell Building Robot