Tapered cap for no spill cup

thingiverse

i was going through lathe things and saw this cup, it is a brilliant looking device. i read the reviews and someone stated that a tapered opening to the cup would help to keep the drips from going down the sides of the cup. i made the cap taller, and make grips on the cap for easier removal. as of this post, i have not printed it yet. will update when printed.