About this 3D model

针对内径为75mm口径的纸质料盘（例如R3D）进行的设计。 Specifically designed for paper reusable spool with an inner ring diameter of 75mm. 料盘内有卡口，嵌入之后顺时针旋转直至卡紧。 There is a bayonet in the reusable spool. After inserting, turn it clockwise until it is locked.