Parametric Lid with protrusions

This model is useful if you lose a bottle cap. All dimensions can be made to your desired size.

Please refer to the image below for the meaning of the parameters. 

"Clearance" represents the tolerance. A smaller number allows for a more precise fit, but I recommend using a value between 0.2 and 0.5.

knurl_size is the diameter of the protrusion on the outside of the cap. It can be set to various sizes, but must not exceed twice the shell_thickness.

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https://makerworld.com/ko/models/2422977-parametric-pipe-adapter#profileId-2657415