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I do keep meaning to pick up a Timemore C2. I rarely use hand-grinders these days (aside from the weekly trip into the office) so it seems a bit wasteful when I've got 2 already. But now I'm used to the quality of the Sette, going to a Rhino/Porlex is noticeable.
My Sette has a little cover for the exit that you can open/close easily (when taking a full hopper off for example), but waiting for the right moment to close it is a step too far for my liking! Don't think the tamper trick would work on mine as it's got a little cover over the centre of the hopper. Might just try loading in the next batch of beans and see how that impacts both brews. Though that comes with the pain of accurately setting grind time...
Fucking coffee
I think buying a semi decent hand grinder is worth it.
The timemore c2 can be had for £45 if you buy direct from China and don’t mind waiting a couple weeks for delivery.
As for single dosing, I put a spare tamper in the top of my Mazzer to stop popcorning as it grinds. I also blow it out with a little bellows to clear any retained ground once it’s stopped. Less than 0.1g retention.