How is the Duo for filter on the espresso burrs and can you switch back and forth? I know there is a dedicated brew burr but I wonder if the espresso one will do adequate brew. I’m not doing to switch the burr set twice a day so it would be a deal breaker… although I know there isn’t currently a flat burr grinder out that does do both well interchangeably.

I drink both brew and espresso every day so if I can do both without switching burrs that would be great.

I drink med-dark and use a Moccamaster so it doesn’t need to be perfect like a carefully poured light V60, but the switching regularly is the main thing for me.

    Seems like people are not understanding how this works. You get a dedicated no retention grinder for espresso or brewing, with the ability to change burr fast w/o loosing alignment. This is the idea behind this grinder.

    Df83 can’t do that, also, there is no bellowing, or rdt.

      As Denis says

      It takes a minute to swap out the burrs

      If that means you’re going to get better flavours and experiences from the £18/250g of beans you have bought, then would you not do that?

      I’ve honestly not tried the espresso burrs for filter, there’s an obvious difference in them

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      Cuprajake - It wasn’t clear (for me at least) in your post whether you ran the Duo with SSP burrs. If you did, how was it? Is it a straight forward swap?

        wilburpan I looked into this, and answered that this information doesn’t seem to be available of the Niche,

        Nothing to apologise for! All good.

        For me, I was happy to understand that a DC motor runs very differently from an AC motor, in the sense that it draws what it needs to draw, as explained by Dave. So for me at least, that was the answer to the question.

        And I did read your post and that the information is not readily available for the Niche. :-)

          Cuprajake The burrs come on their own carriers, they are designed not to be swapped out for other burrs, they are designed for mazzer burrs only

          Everything in this is correct, although it should be pointed out that other burrs may fit…but the carriers are made to be a perfect fit with the Mazzer burr sets used. It might be that other burrs fit perfectly, or they might need shimming (with proper shim washers) if they are not quite thick enough. To try and help here’s some technical data on mazzer burr max and minimums…this is because the burrs are cut on around 4 different machines and I can tell which ones. Measurements are from rim to face.

          • Espresso burrs max thickness 9.592 mm
          • Espresso burrs min thickness 9.443 mm

          A difference of 149 microns depending on which grinding machine is used. Tolerance within burrs made on a specific grinding machine is around 3 micron..

          Difference between the thickest and thinnest espresso burrs is across all grinding machines is 0.149 micron. A human hair is about 70 micron.

          • Filter burrs max thickness 9.561 mm
          • Filter burrs min thickness 9.556 mm

          A difference of 5 microns as at the time only 1 machine was grinding filter burrs. Tolerance within burrs made on a specific grinding machine is around 5 micron..

          An object of 5 micron is not visible to the human eye….it’s around the thickness of a single human blood cell.

          As long as the burrs you use are thicker than the minimum sizes, they might be OK, if they are thinner, you would probably not want to shim higher than 100 or 200 micron, for technical reasons.

          The other critical things to mention is the burrs are pretty much an exact fit in the carriers radially and centrally….so the diameter and central hole of any alternative burrs must match almost exactly, the Mazzer 83mm burr sets used. from memory 151B and 151F.

          Another critical point - These were specifically chosen to give the performance required at a particularly low burr speed (which massively improves grind quality) and it’s unlikely SSPs will perform better, in other tests which I can’t go into SSP equivalents consistently performed worse, size for size…

          P.S. The carriers are machined to extremely high tolerances!

          P.P.S. The test units UK and USA were pre-production and the grinder has been significantly improved since then. test grinders were selected to be average to below average in performance, not cherry picked to be the best ones..In fact the best were selected out.

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              DenisS Seems like people are not understanding how this works. You get a dedicated no retention grinder for espresso or brewing, with the ability to change burr fast w/o loosing alignment. This is the idea behind this grinder.

              Df83 can’t do that, also, there is no bellowing, or rdt.

              Absolutely correct.

              Ernie1 I wonder if the espresso one will do adequate brew. I’m not doing to switch the burr set twice a day so it would be a deal breaker… although I know there isn’t currently a flat burr grinder out that does do both well interchangeably.

              Yes the espresso burrs will give the same filter performance as any other 83mm Mazzer burr grinder when grinding for filter. However, the dedicated filter burr set produces way better filter and aeropress than espresso burrs trying to do the same grind size. It’s a difference that can be blind tasted and not just by experts. A non expert selected the filter burr as better 9 times out of 10.

              So you’re not loosing anything, with everything to gain if you decide to take 60s or less to swap the burrs over. I am hoping that there are independent blind taste tests done of this. it might once and for all change the belief that one burr set can do it equally well.

              The filter specific burr set cannot grind for espresso

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                    DenisS Seems like people are not understanding how this works.

                    To be fair it is a different proposition to the Zero, which is advertised as a one-for-all grinder so understandable people would be slightly confused by the provision of two burr sets.

                    I appreciate there doesn’t seem to be a lot of pourover/filter drinkers on this forum and even fewer who do both every day, but the two-burr sets changes the proposition quite a bit.

                    I asked if it can do both as I’m not fussed about zero retention since I grind on-demand. I’m not going to buy an £800 brew grinder, and if it’s espresso only, I’d go for a used Mythos or similar.

                    I’m not the target market but I’d still be keen if it could do both.

                      DavecUK Yes the espresso burrs will give the same filter performance as any other 83mm Mazzer burr grinder when grinding for filter.

                      Thanks! This is what I wanted to hear.

                      So to clarify, because I’m literally hovering over the buy button… I can expect to be able to make a couple of pourovers in the morning, and a few espressos throughout the day, just by changing the settings appropriately?

                      With the added option to switch the burrs if I did want to enhance the pourovers at any point.

                        tompoland can you recall how long ago those tests were run? from memory it’s quite some years ago and would predate recent developments such as Caedo’s Opal Glide or the SSP range. Perhaps its more up to date than I recall?

                        Do you have any tangible reason to think that the grinders you mention do anything statistically different (given Schulman’s protocol) than the grinders tested then?

                            tompoland simply because the differences in terms of in-the-cup is typically more marked between flats and conicals than it is between say one flat at 83mm and another flat at 83mm. More of a level playing field, if you like.

                            It seems you know the results of testing before you do the testing, which seems to make testing moot :-)

                                The calibration zero point is fixed at factory (it can be adjusted but it’s not needed )

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                                  DavecUK the Mazzer 83mm burr sets used. from memory 151B and 151F.

                                  I think they are espresso (151B) and filter burrs (151F) in that order; I reckon they are Mazzer ZM burrs set.

                                    DavecUK IIRC, they advise cleaning the retained coffee, while burrs swapping between filter and espresso.

                                    If one were to swap these daily, we are looking at about 1.4g of wastage a day or about 500g wastage a year. I think this wastage can be avoided / minimised as I am not convinced leaving the retained coffee (0.7g) will make a noticeable difference in the cup. This is for some one like me who would make both espresso and filter daily. The only difference might be a little more fines getting in to V60. That’s a nice trade off, I think.

                                    Any thoughts from experience.

                                        LMSC It’s so little, I don’t think it’s critical either way in the grand scheme of things.

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                                          In a different note: does it take SSP?

                                          It’s not advised as above

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