Cold Brew Coffee Funnel

10/31/2025 - Happy Halloween! I made an update in response to a suggestion. The made the bottom less flat, I gave it more of a slope. And I added another size for the neck of the funnel so hopefully it'll fit more bottles. Cold Bru_V2, Enjoy!

In the summer I like to make cold brewed coffee so I can have a cool drink when it's hot. And the worst part is straining the grounds. I used to use an old automotive funnel and paper filters. But the paper filters would get clogged and tear. 

So I decided to make a solution, by using a reusable stainless steel filter and a 3D print, filtering my coffee is super easy now! I used this coffee filter from Amazon, and it was only $13 or so. I just place the filter in the print, place the funnel in the mouth over whatever bottle you want and pour the coffee in. If the drip starts to slow down, I take a spoon and stir the bottom of the filter. After a while you may need to empty the filter. 

I made my print of of PETG because it is food safe. But just to be extra sure I sanded it down and sprayed a couple of coats of a water based sealer on it. I also only handwash the funnel, and make sure not to get it too hot. THIS IS NOT FOR HOT COFFEE BREWING. Please do not try to make a pour over and anything like that with this print or really any other 3D print unless you got PEEK money. 

I made this on my Ender 3v3 Plus. Printed in PETG, 4 walls, Adaptive Cubic infill @ 25%, and 0.24mm layer height. Printed with the top of the funnel (largest opening) facing up, that is the most stable orientation. A better print could be had if you flip it over as the interior of the funnel would not have the ugly support surface texture. Dealer's choice really. 

Thanks for looking, take care!