The owner of the site wants 10 pounds for the STL. Not even a STEP file. Get serious. Let's make this ourselves.
www.etsy.com
It's a good idea to provide more of the filter surface area

Filtering Funnel Downloadable STL File for 3D Printing - Etsy UK
This 3D Printer Files item by VegOilGuy has 207 favourites from Etsy shoppers. Dispatched from United States. Listed on 18 Apr, 2025

It's a good idea to provide more of the filter surface area