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Video: What Happens If I Get a Stone In My Coffee? (Patreon)

Published:
2025-11-13 15:00:17
Imported:
2026-06
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Content

This is something I've been thinking about for years, so I hope it'll be a useful guide to see what can happen. It was bizarre to film but also a lot of fun, so I hope you enjoy it.

I still worry that something about this borders on irresponsible, perhaps because I can't reconcile what happened in our tests with the posts online about people's grinders breaking. So, for the sake of being a responsible adult: please don't put stones in your grinder on purpose, and definitely don't put bits of metal in there either.

Just for you, here's a link to a very short blooper reel from making this video as well: https://youtu.be/wwjujUO_8w0

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Comments

Väinö Forss

Depending of the structure of the grinder the metal might bend the motor shaft or just knock something out of place resulting poorly aligned burrs.

Lisa Tash

6:10 gave really fun children's science presenter vibes

Samir Talwar

In roughly ten years of making ~50g of coffee a day (AeroPress / V60), I have noticed one stone, which cracked the burr of my Hario hand grinder in half. I think it was ceramic, conical; I’m sure you know the grinder. Tenner for a replacement burr, and I didn’t think to notify the roaster. The main problem was that I had no coffee at home for a week.

Chris Armour

This video reminded me why I stopped buying coffee from the most prominent roaster in my area. The stone in that case stalled my Niche Zero and took a wee chunk out of the burr. Perhaps a bit harder than the stones used here. Never noticed a change to the flavour of the coffee produced though.