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Reccomended model:  Medium Flow

Try printing in TPU/PEBA or other flexible filament for a good seal, otherwise, I cut a small gasket out of paper which worked well. I have also included a Gasket model which can be printed out of flexibles or used as a cutting guide. If anyone wants to remix to add room for an o-ring that might be useful. : )

Printing Considerations:

Keep in mind interior over hanging threads when printing. If you encounter problems consider reducing outer wall speed or change wall print order to [Inner -> Outer].

Print orientation shown in last image.

Thread model from here: