What is your expeience with the Porlex Mini II manual grinder?
It’s the only grinder I’ve ever used, I find it quite handy and consistent in the grinding but I have actually no benchmark to judge it objectively. Is it actually good?
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Unless you are attaching your hand grinder to an electric drill, a person cannot apply enough force or speed to generate the high RPMs to generate heat. You are way off based on this.
You and I may disagree, but hot damn Timemore makes a sexy product.