Mahlkönig E64 WS – Grind-by-Weight

Mahlkönig E64 WS – Home Espresso Grinder with Grind-by-Weight and Grind-by-Sync

You hang the portafilter in the fork. The grinder detects the weight, the display shows 0.0g. The motor starts automatically, the 64mm special steel burrs get to work, and the coffee grounds fall into the portafilter. 12.0, 15.0, 17.8, 17.9, 18.0 grams – the grinder stops. Not after six seconds, not after an estimate, but at the weight you programmed. Tomorrow, the day after tomorrow, in three months: the same 18.0 grams. The beans age, humidity fluctuates, the hopper empties – the dose remains constant.

The Mahlkönig E64 WS is Mahlkönig's first home espresso grinder with Grind-by-Weight and the new Grind-by-Sync technology. Unveiled at HostMilano 2025, it builds on the same 64mm burr set as the professional Mahlkönig SD64, bringing a feature to the home kitchen that was previously reserved for gastronomy: dosing accurate to 0.1 grams, reproducible with every shot. Coffee Coaching Club is a partner of Mahlkönig in Switzerland.

Grind-by-Weight

Most electric espresso grinders grind by time. You set five seconds, and the grinder grinds for five seconds. The amount of coffee grounds produced depends on many variables: how dense the bean is, how moist it is, how full the hopper is, how old the roast is. In practice, this means: an intended 18 grams might turn into 17.4 grams one time, and 18.7 grams another. If you extract by weight ratio (1:2 as a starting point), you get a different extraction dynamic every time – even if the output is correct.

The E64 WS solves this with an integrated scale directly under the portafilter fork. The coffee grounds are weighed in real time as they fall from the burrs. The motor stops as soon as the programmed weight is reached – with a resolution of 0.1 grams. The deviation from shot to shot is in the tenth-of-a-gram range – more precise than most manual weighings with an external scale.

What this means for the taste: If you want to understand your extraction, you need a stable variable. The dose is the most fundamental. If it is constant, changes in grind size, bean changes, and temperature variations only then become clearly discernible. Without a constant dose, every change is a guessing game. This is the real value of Grind-by-Weight for home use.

Grind-by-Sync – when grinder and machine talk to each other

Grind-by-Sync is an interface that connects the E64 WS with compatible Mahlkönig devices. Specifically: with the Mahlkönig Sync Scale or the Mahlkönig Xenia. In a Sync setup, the Sync Scale measures the actual extraction time or the output weight. If the shot is outside your recipe parameters, the system signals the grinder: finer or coarser, automatically, to bring the next shot closer to the recipe.

Important context: Grind-by-Sync is an ecosystem feature. With non-Mahlkönig machines, the E64 WS functions as an excellent Grind-by-Weight grinder, but without automatic grind size adjustment. Those who use the Sync Scale get full automation. For everyone else, GbW remains the core feature. Functions can be extended over time through Over-the-Air software updates.

Electric Grind Size Adjustment in Micrometer Steps

The E64 WS has no ring, no knob for grind size. The burr distance is electronically adjusted via a sensor-controlled motor (Disc Distance Detection, DDD) and displayed on the screen in micrometers. A single micrometer corresponds to approximately one second of extraction time difference – a precision that has rarely been seen in this price range before. Zero point calibration is tool-free and guided on the display: you move the burrs together until they touch, set the zero point, done. After a burr change, the grinder is back at its reference point in a few minutes.

This includes a ball-joint spout that flexibly adapts to various portafilters, and a metal clump buster (now included as standard). The LED display has adjustable ambient lighting at the spout – the color can be matched to the setup, if desired.

At a glance

Who is the E64 WS for?

The E64 WS is suitable for home baristas who want an electronically controlled grinder with reproducible dosing and who prioritize convenience over tinkering. Those who make one to four shots a day with the same bean, save their recipes, and don't want to bother with an external scale every time, will find exactly what they need here. Those who also use the Mahlkönig Sync Scale get the full Sync ecosystem.

The E64 WS is not for everyone. Those who switch between multiple beans daily and consistently work with single-dosing will find an alternative optimized for single-dosing in the Varia VS6 (exclusive Swiss importer) or the Weber Workshops EG-1. If you are looking for 80mm precision with a pre-crushing system: Option-O Lagom 01 or Lagom P80. The E64 WS is a hopper-first grinder – retention in hopper mode is around 4 grams, which needs to be purged when changing beans. Its strength lies in dose automation, not variability.

Important to know: The E64 WS is designed as a home grinder. It is built for one to two espressos in quick succession, not for continuous commercial operation. The maximum daily output is 2.5 kg; commercial use is not covered by the warranty.

Order directly online

The Mahlkönig E64 WS can be ordered directly from the webshop. Delivery throughout Switzerland and to Liechtenstein in 2 to 4 working days. Click and Collect in Bern, Gerberngasse 44 and Zurich, Hagenholzstrasse 50b. The E64 WS is in daily use there – Grind-by-Weight and the electronic grind adjustment can be experienced directly in the showroom. Financing possible via Heylight.

For questions about Sync integration, comparison with other 64mm grinders, or the right machine: office@coffeecoachingclub.ch or by phone during business hours.

What goes with it

The E64 WS works with any portafilter machine. The full Sync ecosystem unfolds with the Mahlkönig Sync Scale, but it also delivers excellent results with machines like the La Marzocco Linea Mini R, La Marzocco Micra or a Rocket Espresso – Grind-by-Weight also works without Sync integration.

If you want to change the aroma profile of the E64 WS later: SSP 64 mm burrs (High Uniformity, Multipurpose, Lab Sweet) fit into the grinding chamber – the tool-free zero-point calibration on the display makes changing them uncomplicated. Mahlkönig points out that installing non-original burrs may affect the manufacturer's warranty.

For consistent weight measurement at the output: Acaia Lunar. Affordable alternative: Normcore Scale (exclusive Swiss importer). For puck prep in espresso: Normcore WDT and Tamper or Weber Workshops Moonraker and Really Nice Tamper. For precise coffee water: Apax Labs mineral concentrates (exclusive Swiss importer). For airtight bean storage: Airscape. Background information on burrs, particle distribution, and extraction in our Sensory World.

Frequently Asked Questions

How accurate is Grind-by-Weight on the E64 WS?

The integrated scale has a resolution of 0.1 grams. The deviation from shot to shot is in the tenth-of-a-gram range – more precise than most manual weighings with an external scale. If you program 18.0 grams, you get 18.0 grams with minimal fluctuations.

Does Grind-by-Sync work with every espresso machine?

No. Grind-by-Sync is a Mahlkönig ecosystem and works with the Mahlkönig Xenia espresso machine or with the Mahlkönig Sync Scale. With other machines, the E64 WS operates as a Grind-by-Weight grinder without automatic grind size adjustment – the core feature remains usable in any setup.

How does the electronic grind size adjustment work?

The burr distance is adjusted via a sensor-controlled motor (Disc Distance Detection, DDD). On the display, the distance is shown in micrometers, and changes are made continuously by pressing a button. A one-micrometer change corresponds to approximately one second difference in extraction time. Zero-point calibration is tool-free and guided by the display.

Do SSP 64mm burrs fit the E64 WS?

Yes. The E64 WS uses the same 64mm grinding chamber as the Mahlkönig X64 SD, and SSP confirms the compatibility of its 64mm lineup – High Uniformity, Multipurpose, and Lab Sweet. SSP burrs are approximately 0.1mm thicker than the original burrs: after installation, the zero point must be recalibrated, which is done tool-free on the E64 WS via the display. Important to know: Mahlkönig points out that installing non-original burrs may affect the manufacturer's warranty. We stock SSP 64mm burrs – this allows the grinder's aroma profile to be specifically adjusted for sweeter or more uniform extractions.

Can I single-dose with the E64 WS?

Yes, with limitations. The bellows are included in the scope of delivery, and the metal clump-buster is now standard. With a 20-gram dose in the hopper and subsequent bellows pressure, single-dosing is possible. Retention is approximately 4 grams according to tests – this is more than with dedicated single-dose grinders like the Varia VS6 or the Weber EG-1, but within the range for a hopper-first grinder with an integrated scale. Those who consistently single-dose with frequent bean changes are better served by a dedicated single-dose grinder. The E64 WS is primarily designed for continuous use with one type of bean.

How quickly is the E64 WS delivered in Switzerland?

2 to 4 working days throughout Switzerland and to Liechtenstein. Click and Collect in Bern and Zurich. Financing possible via Heylight.

Can I see the E64 WS before buying?

Yes. In the showrooms in Bern (Gerberngasse 44) and Zurich Oerlikon (Hagenholzstrasse 50b), the E64 WS is in daily use. Grind-by-Weight, the electronic grind adjustment, and the Sync behavior cannot be conveyed through photos. Bringing your own beans is welcome.

Where can I buy the Mahlkönig E64 WS in Switzerland?

At Coffee Coaching Club as a partner of Mahlkönig. We carry the Mahlkönig range including Sync Scale and accessories. Order via coffeecoachingclub.ch, by phone during business hours, or in the showrooms in Bern and Zurich.