Moving between espresso and filter on the same burrs is one of the best parts of owning a Z1. This guide covers how to make the switch smoothly, why the dial can feel stiff on the way back to espresso, and how to keep your results consistent from day to day.
Starting points
The numbers on your Z1 dial are the gap between the burrs in microns (µm). Lower numbers are finer.
| Brew method | Burr gap range | Typical starting area |
|---|---|---|
| Espresso | 50 to 300µm | 200µm |
| Filter | 300 to 800µm | 625µm |
| Pour over | 400 to 1000µm | 625µm |
Once you find settings you like, write down your espresso and filter numbers. Returning to a known number is faster than dialing in from scratch each time. For the full chart and taste adjustments, see Z1 Grind Settings, RDT, and Retention.
Going coarser (espresso to filter)
This direction is easy. Turn the dial toward higher numbers, then grind a few beans to clear the espresso grounds from the chamber before brewing.
Going finer (filter back to espresso)
When you grind at a coarse setting, coffee particles can stay packed in the flat finishing areas of the burrs. Turning finer squeezes those particles, so the dial can feel like something is pushing back. This is normal for high-precision flat burr grinders, and burrs with large finishing flats, such as SSP HU, SSP CV3, and Mazzer, feel it the most.
- Turn the grinder ON. Always adjust finer while it is running.
- Slowly turn the dial toward your espresso number. You will feel some resistance as the grinder pushes the packed grounds through. With the grinder running, it should be much easier than with it off.
- If the dial feels very heavy, stop and do not force it. Open the grinder and brush out the burrs and chamber, then try again (see Opening, Cleaning, and Closing Your Z1).
- Grind a few beans at your espresso setting before your first shot so the chamber holds fresh, fine grounds.
Is my zero still true?
Packed grounds can also cause false chirp. Coffee rubbing on metal sounds a lot like the burrs touching. If you set zero on that sound, your grinder will actually be coarser than the dial shows, and shots will run fast.
Signs your zero is off: shots that gush even at familiar settings, needing to go finer and finer, or shot times that swing from one day to the next on the same beans.
To confirm true zero:
- With the grinder ON, slowly turn finer until you hear true chirp, a sharp metal-on-metal sound.
- Stop right away, turn the grinder OFF, and rezero (see Setting the Zero Point on Your Z1).
A small zero shift of 20 to 50µm is normal while new burrs season, after cleaning, or after a burr swap. For more, see Troubleshooting: False Chirp and Zero Point Shift on the Z1.
Video:
Keeping results consistent
Plan your order. When you can, grind espresso first and move coarser for filter afterward, rather than sweeping from coarse back to fine.
Rezero only on true chirp. Avoid resetting zero between sessions unless you have confirmed the sharp metal-on-metal sound.
Weigh both ends of your shot. If shot times change, check that your dose, your yield in the cup, and your dial number are the same as last time. Change one variable at a time.
Tap the funnel. After grinding, with the grinder still on, tap the top of the open funnel 2 to 3 times so leftover coarse grounds do not end up in your next espresso dose.
Two burr sets? Keep one set for espresso and the other for filter.
Still having trouble?
Email info@zerno.co with a short video of the dial and the sound while you turn finer, along with your burr set and the settings you use.