Parametric espresso grinder funnel.

I hate it when I'm grinding coffee into the handle and a lot spills past the edge. For years I've used a simple paper ring to increase the effective height of the portafilter basket edge, but now I've got something to increase the effective diameter too. Absolutely no mess at all!

The STL file gives an opening size of 78mm (with base to fit inside a standard 58mm portafilter basket), and increases the height by about 30mm (with 10mm inside the basket).