As the outlet deepens and the material boils, vapor produced erodes the molten partitions blowing ejection out and further enlarging the hole. Nonmelting products for example wood, carbon, and thermoset plastics tend to be Slice by this process. Mortise and tenon joints are similar to finger joints, besides the "fingers" https://juliusxdgnq.snack-blog.com/36824407/cnc-mills-for-small-batch-production-an-overview