It's a small grinder with small hopper.
I drink single shots. So I grind 7g. I keep checking the weight all the time. It is pretty consistent ~0.2g variations most of the time. But sometimes (not often) I am getting ~0.6.
My observations so far:
- when I change beans smaller beans produces more ground coffee during the same grinding time. My guess when beans are smaller more of them can get into the burr at the same time. And probably they can "slide" under the "umbrella" faster.

It means if beans size is less consistent the weigh output will be less consistent too.
- if I put more beans into hopper I get 0.2-0.3g less ground coffee during the same grinding time.. Probably extra wight "slows down" beans in the hopper - there is a little "umbrella" in the bottom of the hopper. So bean have to "slide" under the "umbrella" - I guess extra weight slows them down.

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