I designed and printed it to replace my partially-broken funnel. According to the serial number on my funnel it's 3016JA2004 (no E at the end), but online this spare parts seems to be called 3016JA2004E.
My design is not perfect since I didn't flare the ring at the bottom to account for the full width of the water button, but in practice this has not been a problem on my fridge.
Support is needed for the two side overhangs, and it's also useful for the small circles to the sides of the top frame, and for the outside wedges of the 4 holders. In my print I also lowered the layer height starting with the 4 holders, to help with the details of the wedges.
The author marked this model as their own original creation.