A drip tip for tanks with an 8.5mm diameter drip hole and a ~23mm diameter body/mod.
On the inside of the cylinder there's a siphon that prevents unpleasant hot e-liquid drops reaching your mouth. Such a large body guarantees a good airflow: this tip won't impact the airflow pressure of your dripping.
Printing upside down may help in some cases. Only apply supports that touch the buildplate! Be careful not to put supports inside the siphon, or you won't be able to remove them afterwards.
Even if there's a slot for an O-Ring - depending on your printer's tolerances - you should be able to press-fit the drip tip in the tank's drip hole.