This is a spray head to hold Mentos and drop them into a bottle of Diet Coke.
This is based on LT1Pat's great work on the pop bottle threads; I rebuilt it short enough to fit my Emaker and made the spray head integral, with internal slopes steep enough to print without needing support in the middle.
I just updated the files to get the jet centered and add some material to the outside of the threaded area.

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