Soda Bottle Funnel

I wanted a funnel that I could screw onto a pop bottle that we use as a bird feeder (see https://www.thingiverse.com/thing:1710755) to more easily get the seed in. Laird had one created in https://www.thingiverse.com/thing:157541, but the funnel was simply too big for my printer. So, I used the threads from that project with a smaller funnel in TinkerCad. Done.

One note: I suspect this probably isn't liquid tight, but I honestly haven't tried. But it certainly works for bird seed. :-)