This is a pre-filtering funnel for use with Sawyer Squeeze Water Filter pouches.
It has a standard water/soda bottle thread.
My intention is to screw this onto the Sawyer pouches to make them easier to fill (with the funnel part), and at the same time to keep leaves and twigs out (the filtering part).

This is an add on to Laird Popkin's 2 Liter Bottle Holder with Funnel and Cap. I added the grid on top, and an extra support ring where the cap and funnel meet.

I also intentionally decreased the $fn argument when rendering the cap so that it is less round, and thus hopefully easier to turn.

When printing this, I needed to slow my first layer print speed to 10mm/s. When it was faster, the little squares that got printed sometimes didn't stick properly.