zzk12313 wrote:thank you, I am the only one who loves coffee in my family, so at most time, it is a single dose, but I am ok with f64e which may be considered as a commercial grinder.
Just in case: single dosing refers to putting a set quantity of beans (e.g. 15g) in your grinder and expecting the same quantity coming out as ground coffee. This works well with a grinder like the Niche Zero, which was designed to have next to no retention (hence the name).
The alternative is to have a large amount of coffee (e.g. several hundreds of grams) sitting in the hopper, to grind for a set amount of time so as to get your 15g of ground coffee out, understanding and accepting a certain quantity (e.g. 4-5 grams) will be ground, but won't come out (this is retention). It will come out the next time you grind some more coffee (e.g. the next day). You can choose whether to to discard it (by purging your grinder) or have that 1-day old ground coffee included with the newly ground, fresh coffee.
I personally think it's not a good idea in a home environment (especially if you are the only coffee drinker in your household, which is also my case) to keep large quantities of beans sitting in a hopper, and I don't like wasting expensive beans either, which is why I prefer the single dosing approach. Busy coffee shops are entirely different environments and have entirely different considerations.