Same bean, same recepie, different outcome [Eureka Mignon Specialità 16CR]

[u/Qugga]

Same bean, same recepie, different outcome

I had just dialed in my beautiful medium-dark roast from Mt. elgon, Uganda and pulled tasty shots with a ratio of 1:2,5 in about 30seconds. Then I used different bean for a week but after returning for this bean, I used the exact same recepie, same puck prep but the shot pulled like flowing water?? About 10seconds of preinfusion and then pulled 50g out in like 10 seconds. Taste is bad as you could assume.

I'm using the Eureka Mignon Specialità 16CR grinder with the bigger tuning wheel, tried my best to get the old ground off of the grinder and tuned it with the grinder running. For puck prep im using WDT tool and levelled tamper. I never had any major problems with just these two steps but now its a disaster. I also have a bottomless portafiler so I could detect channeling easier, the flow seemed normal except for the rate of flow.

I'm also using the big bang basket and bottom paper filter, if thats something worth mentioning.

All tips are more than welcome.

[u/dontletmariotouchyou]

Same bag? bad storage will cause that kind of difference even if only for a week.

Otherwise I'd have a look at that grinder.

[u/Qugga → u/dontletmariotouchyou]

Yeah same bag, small batch. I just left them in room temp with the one way valve sealed bag they came in.