Thank you for your advice. You can create a suitable gap at the upper end of the ring by adding a negative cube part in the slicing software. After slicing and printing, you can use the toughness of the material to assemble it into the lion's mouth. This is how I handled it. However, please note that it is recommended to choose PETG or TPU filaments for printing, as these materials have good toughness and are not easy to break.