simonc Kopi Deva advise that a slower RPM gives a more uniform particle size which slows the shot down.
So maybe 0 grind setting and 500rpm rather than 700 rpm will give a 38 second shot time but then doesnt changing particle size distribution affect the taste. ie more/less clarity, more/less body.

    Kinda sounds like excuses .. if you have to use a certain speed - its not really a variable RPM is it ? What happens if you run it full speed ? - Oh I see you did - it does not make a-lot of sense ?

    Good point, hadn’t thought about it like that. Or rather, its I can’t use a certain speed as it doesnt necessarily give the best taste for that RPM, ie a shot of either 30 seconds or 40 seconds, no option for 33 or 36 seconds for instance.

    (My machine has 10 second pre infusion so generally go longer than 30 seconds which I mean from turning on the pump to turning off. not counted on drips etc)

      simonc what espresso machine are you using and have you had this issue with other beans? Doesn’t sound ideal though as judging from other posts it should have more espresso control, so if you’re sure it’s not a beans or espresso machine issue I’d insist on a replacement at the very least.

          FadedFrontiers I have an ACS Minima. As I said above, I can get a 3-4 second change in shot time on my Niche Zero on same beans.

          Also a lesser but still annoying issue. Sunday, I turned on the switch at the back to connect the battery. Showed 50%. 2/4 lights. Ground and made 2 coffees. over an hour Left everything on, and went to make another coffee 30 mins later and the grinder battery was dead. I am sure they will say to turn it off at the switch but really wouldn’t expect battery to die that fast when it’s only really lighting up 2 little blue LEDs.

          Been told they dont do returns for pre-orders but I wouldn’t be returning as I dont like it, but that it doesnt function as a £800 grinder should do for espresso. And they offer espresso accessories so clearly marketed as an espresso capable machine.

              wow, thats poor

              it should do as intended or its not fit for purpose. and its not like you can sell it onto someone knowing it wont grind for espresso

              have you tried different burrs in there?

              Decent De1pro v1.45 - Niche Duo - Niche Zero - Decent is the best machine ever made -

                simonc yeah that doesn’t great, how much do RPM changes alter shot time with same grind setting, in your experience?

                I add say that the NZ is completely different with it being a conical (and a very forgiving one) so not totally comparable, flats can be tougher to dial in and more sensitive to changes in my experience.

                I also didn’t think the minima had any PI chamber or setting, are you using flow control?

                    Cuprajake glad it’s not just me. No, the standard burrs, which as recent direct order, rather than Kickstarter, are Mazzer Super Jolly.

                    Yeah, hard to sell unless maybe as a filter only grinder, but limits market on already a bit of a niche product.

                      FadedFrontiers yes true, but just indication that the beans aren’t crazy to grind and yes on my old flat burr I could adjust for 3-5 seconds easily.

                      Maybe I am wrong, yes I have flow control, but not using whilst I sort out the grinder so keep consistent. I see the machine doesnt start increasing pressure beyond 2 bar until maybe 8 seconds and hits full pressure at 12 seconds.

                          I have the grinder for 20 months now and never had any of those issues.

                          I have a programmable espresso machine and the shots always end within .5 secs.

                          Only drinking espresso as well. Could not be happier with the grinder.

                            mackerel yeah but that doesnt help him,

                            @simonc see if you can find some genuine burrs to put in there and see if it helps, you may have a dodgy set of burrs

                            Decent De1pro v1.45 - Niche Duo - Niche Zero - Decent is the best machine ever made -

                                mackerel that’s good to know.
                                What sort of adjustments do you use to dial in? I’d are you adjusting down to fractions of a 0.1 marking?
                                Do you have to adjust rpm to dial in. (Rather than liking to)

                                  well first of all I adjust the amount of beans. Depending on the kind of beans and the age, I put between 19 and 20.4 grams into my 18 gram basket. After that it’s grind size. The 100% canephora beans last week had to be ground much finer than what I usually use.

                                  And yes I adjust between .1 markings.

                                  Rpm can also be used to do fine adjustments.

                                    simonc yeah that’s the best thing to do as flow control can add variables. Really seems like you got a dodgy unit.

                                    Out of interest has seasoning the burrs so far improved things at all compared to day 1?

                                        mackerel cool. I’m keeping dose fixed for now. What time difference does a 0.1 change make for you?