Get a good kettle that can pour very slowly if you don't have one already. I do 18/300gr V60's with the plastic V60-01 doing 50gr blooming for 30-40s and 50gr pours after that for a total time of around 3:00min. I can make perfectly consistent V60's time after time doing that. Bitter is still overex...

You clearly have no experience with those grinder as what you're writing is completely wrong. I'd also expect planes worth 100 millions of dollar to not loose a door midflight or have any kind of problems even with the most strict QC on the world and it happens. And it takes months for them to be in...

Kind of a hard response. Well look the stalling issues with the lagom 01 with no solution and I've also seen problems with Kafatek grinders. This things can happen with smaller manufacturers. If you don't want that than buy a Mazzer, Eureka or something like that and accept lesser coffee. Maybe you ...

Well generally speaking in espresso sour is underextraction (grind finer) and bitter is overextraction (grind coarser). But with light espresso roasts there's a lot more going on than that so it's not that simple. With lighter espresso roasts you want to do a pretty decent PI (say 7-15s) followed by...

Great to hear that it was the beans as that was my first thought (and reply). Now you see that beans do make such a large difference

I've been using the Ultra for espresso for over 4 years having ground 90kg through them and they work perfect for espresso. Yes you're near touching which is completely normal for such a unimodal burr. I can still choke my machine with every bean using a Sworks Billet Basket so enough room for espre...

Stoll espresso is great

You do know that shimming and using the marker test is no guarantee that it's aligned. Or did you test all of the runouts? There are multiple people here that bought a DF64 series grinder that had a good marker test after shimming but where horribly misaligned. Your story sounds like a alignment iss...

Why would a Mazzer be inferior as they have way more experience than Zerno and own tons of equipment for building gear that Zerno will never own. And you do know that the marker test is by far a good test for proper alignment as there's much more to alignment. I do think you're underestimating Mazze...

What grinder are you using? And how do you know it's well aligned?