Portable lever espresso makers
Portable levers are espresso presses with no pump or electricity: hot water is poured above a puck of coffee, and it is the force of the arm, multiplied by a lever, that makes the pressure. They revive the principle of bar levers to make espresso at home or while traveling.
How do you make an espresso by arm strength?
Start the scene or choose a stage. The animation simplifies the mechanism; what follows gives the details and the available references.
With no boiler, it is the hot metal that must hold the water at temperature: the cylinder is first soaked in water that has just boiled, thirty seconds at one of the manufacturers, which later added an insulating sleeve at the request of its first backers.
Read the stages without animation
- PreheatWith no boiler, it is the hot metal that must hold the water at temperature: the cylinder is first soaked in water that has just boiled, thirty seconds at one of the manufacturers, which later added an insulating sleeve at the request of its first backers.
- Tamp and pourThe fine grind, tamped in the basket, waits at the bottom of the cylinder; hot water is poured above it, at the desired temperature. It wets the puck before any pressure, which is what Valente was trying to obtain from a pump machine in 1960.
- Lower the leverThe piston is set in place and the lever is lowered in a steady motion. The lever multiplies the effort of the arm: holding 9 bars on a 40 mm piston takes about 1,130 newtons, the weight of a 115 kg mass, which the arm does not supply alone.
- Meter the pressureOn some versions the pressure gauge shows the pressure; it is held at around 6 to 9 bars. The designer of one of these presses advises 6 to 7 bars, which is gentler; Cameron and his coauthors also went down to 6 bars so that fine grinds would not clog the puck.
- Release at the end of the strokePressure drops as the water runs out: the profile rises then falls under the hand, as on the spring levers of bars. The cup stays small, 50 mL at most for one of the models.
To remember: The portable lever replaces the pump with the arm and the boiler with preheating: pressure is set by hand, reading the gauge.
In history: In 1947, Achille Gaggia patents a piston driven by lever and spring; portable presses take up its principle without a boiler; the designer Patrick Hunt says he drew his around 2002.
Read the full article and its sources ↓History
Their ancestor is the bar lever. In 1947, the historian Jonathan Morris recalls, Achille Gaggia patented a piston driven by a lever, with gear and spring, which pushes the water from the boiler through the puck at pressures that rise then fall between 3 and 12 atmospheres (source 1). Morris notes that lever machines remained common in the south of Italy, perhaps because their variable pressure gives, in experienced hands, gentler extractions (source 1). The E61 patent acknowledges it in its own way: continuous-pressure machines, Valente wrote in 1960, do not give the water time to infuse, which hand-operated pistons allow (source 6).
The lever without a boiler came much later. The designer Patrick Hunt said in 2020 that he drew the first version of his press eighteen years earlier, so around 2002 (calculated), and he runs Presso, the parent company of ROK (source 3). The motion is that of a two-armed lever: the portafilter is loaded, boiling water is poured into the upper chamber, and the arms are lowered (source 3).
The Flair is the work of a retired engineer. Sergio Landau, 65 in 2016, of Brazilian origin, had spent nearly forty years as a mechanical engineer in medical devices; he says he designed the object for himself six years earlier, and the Flair arrived at the end of 2016 after a successful crowdfunding campaign on Kickstarter (source 2). It consists of three main parts, a base and an articulated lever in cast aluminum and a brewing cylinder in stainless steel, with a handleless basket 40 mm in diameter and 31 mm deep (source 2).
The Cafelat Robot openly looks backward. Its founder, Paul Pratt, drew it after Faema's Faemina Baby, a lever machine from the fifties: two side handles drive a piston that pushes the water into a basket 58 mm in diameter and 60 mm deep, which holds both the water and the coffee (source 4). The body is cast aluminum, the baskets stainless steel, the seal silicone, with no plastic part at all (source 4).
The motion
The motion is similar from one brand to another: grind fine, tamp the grind in the basket, preheat, pour the hot water, set the piston, then lower the lever or the arms in a steady motion. Without a boiler, preheating matters: the 2016 Flair calls for a thirty-second soak of the cylinder in water that has just boiled, and the brewing water is poured at the desired temperature (source 2).
The calculation explains why a lever is needed. Holding 9 bars on a 40 mm piston takes a force of about 1,130 newtons, the weight of a 115 kg mass; holding 6 bars on 58 mm, about 1,590 newtons, or 162 kg (calculated from the diameters in sources 2 and 4). The lever multiplies the effort of the arm, and the pressure gauge on some versions is used to meter it (sources 4 and 5). Paul Pratt advises staying under the standard, at around 6 to 7 bars, which are gentler and work much better on his machine (source 4); Cameron and his coauthors also went down to 6 bars so that fine grinds would not clog the puck (source 7).
The settings
- GrindFine, espresso type; not quantified in the sources read. Cafelat supplies a second, pressurized basket for pre-ground coffee (source 4).
- Dose17 to 28 g stated for the 2016 Flair (source 2).
- Brew ratioNot documented in the sources read; up to 50 mL of drink for the Flair (source 2).
- TemperatureThat of the water poured, after preheating the cylinder: thirty seconds of soaking in boiling water for the Flair (source 2).
- TimeNot documented in the sources read.
- PressureSet by arm; 6 to 7 bars advised by Cafelat (source 4), readable on the pressure gauge of some versions (sources 4 and 5).
What it has going for it
- They make an espresso with no electricity or boiler; the Flair and the Robot alike have no electronics (sources 2 and 4).
- Pressure is set by arm during extraction, as on bar levers, whose gentler extractions Morris reports (sources 1 and 4).
- They have few parts, in cast aluminum and steel, which their designers present as a guarantee of durability (sources 2 and 4).
- The water can be left to wet the puck before pressing, which is what Valente was trying to obtain from a pump machine in 1960 (source 6).
What is held against it
- Without a boiler, heat is lost into the metal: the cylinder must be preheated, and the Flair provided for its later runs an insulating silicone sleeve, at the request of its first backers, even though Landau did not judge this loss significant (source 2).
- The effort is real: holding 9 bars on a 40 mm piston takes about 1,130 newtons, which only the lever makes bearable (calculated, source 2).
- A grinder able to grind fine is needed; for pre-ground coffee, Cafelat has to supply a pressurized basket (source 4).
- One cup is made at a time, of 50 mL at most for the 2016 Flair (source 2).
What it gives in the cup
No published measurement comparing the cup from a portable lever with that from a pump machine was found. What is known comes from the physics of espresso: pressure and grind fineness set the extraction, and a grind that is too fine under 9 bars clogs in places, which makes extraction uneven (source 7). A lever held at around 6 bars falls in the zone where Cameron and his coauthors obtain more regular extractions (source 7).
The pressure profile, which rises then falls under the hand, brings these presses closer to Gaggia's spring levers, whose crema built their reputation (source 1). The Robot's deep basket, which holds the water and the coffee, and the Flair's small basket limit the size of the cup (sources 2 and 4).
Anecdotes
- Sergio Landau recalls that in the Brazil of his childhood, children of four or five drank milk coffee every morning at breakfast; from his Flair, he wanted a durable object, “not for two or three years,” but for generations (source 2).
The sources for this sheet
- Jonathan Morris, “Making Italian Espresso, Making Espresso Italian,” Food and History, vol. 8, no. 2, 2010, p. 155-183, DOI 10.1484/J.FOOD.1.102222 (author's preprint, University of Hertfordshire) · online · academic
- Howard Bryman, “The Flair Machine Spreads Pizazz to the Portable Espresso Market,” Daily Coffee News, November 22, 2016 · online · press
- Leanne Kelsall, interview with Patrick Hunt, founder of ROK, Luxurious Magazine, May 18, 2020 · online · press
- Howard Bryman, “Cafelat Robot Espresso Maker To Blast Off Later This Year,” Daily Coffee News, July 13, 2017 · online · press · reading: yes (read through a summarizer, quotations noted; the raw text could not be retrieved)
- Flair Espresso, home page, pressure gauge captions, accessed October 21, 2026 (manufacturer) · online · manufacturer
- Ernesto Valente, US patent 3,230,974, “Alternately seating valves,” Italian priority of September 24, 1960 (16,620/60), filed September 25, 1961, granted January 25, 1966 · online · primary · reading: yes (image of the specification)
- Michael I. Cameron, Christopher H. Hendon, Jamie M. Foster et al., “Systematically Improving Espresso: Insights from Mathematical Modeling and Experiment,” Matter, vol. 2, no. 3, 2020, p. 631-648, DOI 10.1016/j.matt.2019.12.019 · online · academic