Just print out the two parts and put them together as shown in the cross-section.
Keep in mind that you should wear the closure like the orange one shown in the picture.
The SolidWorks Files are attached for free customization, as I made adjustments to the actual injection molding closure to make it work well with 3D printing.
Made by @Antonio36996 from HackCS
The author marked this model as their own original creation.