Refilling Funnel for WmBounds Salt/Pepper Grinders

These excellent grinders from WmBounds have lasted us very many years. They never clog up because there is no rough surface for powdered salt/pepper or oils to stick to, so they just never stop working. 

But they can be a little fiddly to refill, as the neck has a shallow trough and the entrance isn't quite wide enough. Before I got a 3D printer that was an unfixable annoyance, but not any more :o)

This funnel is designed specifically to fit these grinders, but any others that happen to have a 27.3mm diameter entrance (or a bit larger) should be fine. 

I haven't included my F3D file because I did it fairly crudely and non-parametrically so it isn't easy to fiddle with. For different sizes it might be easier to start from scratch, although if it's not a huge change that could make the walls too thin or thick, you could just scale the STL in your slicer. The OD of the funnel at the base is designed at 27.3mm, I knew that would fit because my printer prints very slightly undersize, so if yours is very faithful indeed or prints larger then scale XY at something like 0.98 (98%) or whatever to be on the safe side. 

No special printing requirements, although I used a 3-line brim for adhesion just to be safe as the shape is only 3 lines thick at 0.4mm nozzle width. 0.2mm layer height works fine. PLA+ is fine. 60mm/s on my Elegoo Neptune3 Pro no problem.