Just as an interesting fact of 3D printing, to make the funnels the printer requires some supports on the neck, and the part that hooks onto the air intake. The are somehow made with a lot of air in the support. The supports snap right off, and the inside of the neck where the cap screws on usually has some small debris specks. Those have to be removed with my finger. The cap itself has some supports around the 911 text. And if you look at the top of the second photo, the support for the 911 text on the side of the funnel. I have one with my initials on it, just because.
It take about 6 hours to print one funnel.
It is fascinating to see the printer working. From a digital file designed in Solidworks to a physical funnel. The design part is the hardest part. I figured the folks on the board that have never printed anything in 3D might want to know.