Nice job Andy! I'm curious any reason why the funnel has to slope towards the end? I put a chute on my Mazzer last year and mine doesn't slope (its straight sided). Have you tried a straight sided chute? Is there any difference?
fwiw i was opening a xmas calendar gift this am, and the tube package it came in seems to be a perfect raw material for this. 1 3/8" nominal size. 1.4" OD. Solid fit. No tape or glue. And it actually looks pretty good in the grinder. Just cut them to length on a bandsaw. I expect you can cut them w/any number of tools.
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