I made this funnel so that the funnel doesn't seal air in the thing that you want the liquid in. If the air can escape without having to bubble up through the liquid, the liquid will go down much easier.
I updated the funnel to use less material. I haven't had time to test it, so please let me know if it works. instead of using a channel cut into the side, it uses some braces to hold it off of the cup.
The author marked this model as their own original creation.