Breville espresso funnel
by macemace, published
Helps prevent spilling when loading coffee grounds into the filter cup.
Update: Smaller facets would make for a truer inside dia. I had to smooth mine down a bit with med grit sandpaper before the stock tamper would pass through without interference.
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A small lip helps center the funnel over the filter cup.
I had mine made by Shapeways using "Fine Detail Plastic"