Very simple parametric funnel. There are 3 basic sizes included in the print file. To those you can find here as well separate STEP files. bgcode includes all sizes.

In case you are going to slice the funnel yourself please do not forget to set seam position to random. Anyway you will end up with seam line along the funnel height. Certainly funnels are printed up side down, wide end on the base plate.

There is as well included parametric model for Fusion 360. Just enter the requested small diameter of the funnel and the rest will readjust automatically. 

It is very useful for filling jars specially with vegetables, soups. cabbage etc…