https://www.thingiverse.com/thing:6075723 https://youtu.be/KmCcjxr04Fs
My arm was getting tired, so I decided to over-engineer my coffee grinder. It already runs on a standard screwdriver bit hex, so I was actually pretty surprised that nobody else beat me to it.
I’ve found that espresso grinding on my 1Zpresso J-Max is way faster than anything on my Hario. Takes roughly 30sec for a 20g dose in the max and I remember the Hario taking as long as a kettle for an aeropress.