#espresso #knowledge #musings #overview
This collection aggregates our deep-dive resources on espresso science, advanced recipes, and various techniques. We've curated expert insights—from Scott Rao's profiles to the physics of water dispersion—to help you master precision brewing. It's our centralized hub for anyone looking to push the boundaries of modern coffee technology.
Source: An Insight about different espresso recipes
We've introduced "puck resistance" (pressure/flow²) to track coffee bed integrity. By analyzing the first derivative, we can identify exactly when a puck begins to fail. Data suggests that recipes yielding linear degradation, like Scott Rao's Blooming Espresso, produce superior taste by maintaining better structural stability during extraction.
Source: Brian's video about dialing in using the Decent
Brian Quan's dialing-in video has sparked a new community strategy for the DE1. By using "God shot" templates, owners can now match their grind and dose to ideal pressure and flow curves. This collaborative approach simplifies the dialing-in process by providing visual targets for every profile.
Source: A book by Dennis Hew
We're collaborating with author Dennis Hew to release a Decent-specific beginner's guide. This free ebook (also available via Amazon) uses rich illustrations to simplify espresso and milk science. Designed for newcomers, it aims to take users from zero knowledge to professional-quality shots within a few months of ownership.
Source: DE1XXL steaming & latte art
Dennis Hew demonstrates the DE1XXL's powerful steaming capabilities, focusing on professional latte art. He reveals a "pro-tip" technique: steaming in a small 350ml jug for efficiency, then transferring to a 600ml jug. This dual-jug method provides superior foam control and a better pouring angle for intricate designs.
Source: Good milk swirl
This post highlights the importance of creating a perfect vortex during milk steaming. Achieving a strong swirl ensures microfoam is evenly integrated, eliminating large bubbles and creating a glossy, "wet paint" texture. Master this technique to achieve the consistent, silky milk quality required for high-level latte art.
Source: Paul's Spirograph coffee puck technique
Paul's "spirograph" technique involves using a WDT tool in circular, overlapping patterns to perfectly homogenize the coffee bed. By eliminating density pockets and side-channeling, this method ensures a uniform resistance that maximizes extraction evenness. It's a simple mechanical adjustment that yields significantly more consistent, professional-grade espresso shots.
Source: Paul Chan's advice on making pour overs with the Decent, short video clips
Paul Chan explains how the DE1 automates pour-over variables like temperature and flow, allowing brewers to focus on agitation. Using Scott Rao's V60 profile, he highlights the importance of basket cleanliness for spray turbulence and how the XL/XXL models handle larger volumes via superior thermal stability.
Source: BDT: Bugs Distribution Technique
The "Bugs Distribution Technique" (BDT) is a playful take on WDT, using a vibration-based tool to settle coffee grounds. By applying rapid, localized vibrations to the portafilter, it collapses air pockets and levels the bed without manual needles, aiming for a perfectly uniform density for even extraction.
Source: Masterclass: finding the right recipe for your beans
In this masterclass, John and professional baristas demonstrate a systematic "bracketing" technique to find the ideal recipe. By holding dose constant and varying only grind size and yield, they visually map how flavor shifts from sour to bitter, helping users identify the sweet spot for any specific bean.
Source: Espresso is difficult, and a new video strategy
We're shifting our video strategy away from niche technical updates toward topics of general interest, like "right to repair" and open-source hardware. By centering these narratives on our homepage, we're highlighting Decent's unique identity as a collaborative, transparent platform rather than just a machine manufacturer.
Source: Video: The History of Espresso Machines (quickly summarized)
This video tracks espresso's evolution from the 9-bar stability of the E61 to the pressure-declining curves of Lever machines. It highlights Slayer's impact on light roasts via slow pre-infusion, showing how modern technology now replicates and refines these historical "recipes" for total extraction control.
Source: New video: how pressure profiling changes flavor
John compares three foundational profiles: Flat 9-bar, Lever (declining to 0), and Hybrid (declining to 6-bar). He demonstrates how pressure shapes flavor—flat profiles offer brightness, levers provide heavy body, and the 6-bar decline (our "best overall" default) delivers the most complex balance for medium-to-dark roasts.
Source: The amazing accidental physics of coffee grounds
Espresso pucks are remarkably efficient at resisting water. A standard 58mm puck endures ~560 lbs of force—equivalent to three adult male ballet dancers standing "en pointe"—yet restricts flow to the same degree as a tiny 0.2mm hole. It is a rare material that balances such high-pressure resistance with optimal flavor extraction.
Source: Buckman article in Lever Magazine now online for free reading
John's The Lever magazine article is now free to read online. He explores insights from lever machines, applies pour-over lessons to espresso, and details Scott Rao's Blooming Espresso. He also praises the magazine's scientific rigor and an innovative water remineralization technique that simplifies achieving perfect brewing water.
Source: http://Visualizer.coffee is amazing
Visualizer.coffee is the central hub for the Decent community to share and analyze shot data. It offers automated uploads, detailed charts, and side-by-side shot comparisons. Features like "current shot weight" callouts help users dial in complex profiles like Blooming Espresso by tracking pre-infusion drips with surgical precision.
Source: Workflow demo: my Weber Key Grinder, Decent DE1 & portafilter stand & funnel, making espresso
John showcases an optimized workflow pairing the Weber Key Grinder with the Decent DE1. Key innovations include a magnetic tablet stand for auto-positioning and a custom portafilter stand/funnel. This setup prioritizes consistency and speed, designed to withstand the high-pressure environment of trade show service.
Source: Dial in decently: Rao Allongé
This video demonstrates how to brew Scott Rao's Allongé profile, using light-roast filter beans to create high-flow, high-yield espresso. By pushing up to 5ml/s at a 1:5 ratio, it achieves tea-like clarity and sweetness, proving the DE1's versatility in mastering unconventional "filter-style" espresso recipes.
Source: Live: Deep dive into Rao's Filter 2.1 (using Square Mile's Filter Roast)
John details a major overhaul of Decent's video production while dialing in Scott Rao's Filter 2.1 profile. Upgrades include an 8-channel mixer, ceiling-mounted mics, and real-time recipe titling. The goal is professional-grade educational content that captures complex data—like "pour-over" extraction on an espresso machine—with broadcast-quality clarity.
Source: New Decent video : Tamping is difficult
John is replacing outdated technical videos with professional content featuring current products. The new video highlights the V4 self-leveling tamper, explaining that traditional tamping often causes uneven beds and channeling. The V4 simplifies the process using a leveling plate and a 10lb calibrated spring to ensure consistent, horizontal compression.
Source: Video: All about Espresso Body
John and Paul Chan explore maximizing espresso body on the DE1. Using low-temperature profiles (84°C descending to 78°C) and "waisted" baskets, they achieved syrupy 1:1 ratios in just 16 seconds. The results favor the 15g basket for a balance of massive body without sacrificing sweetness or over-concentrating TDS.
Source: New short video: how to remove a portafilter basket
This short video demonstrates a simple, tool-free way to remove portafilter baskets. If pressing the back fails due to tight springs, use a second basket: wedge its rim into the gap, twist to pop it up, and lift it out. It's a quick, damage-free technique for any barista.
Source: Video: making V60 pour-overs with a Decent
John and Paul demonstrate the "Filter 3" method: using a specialized Decent Shower Basket and software profile to automate a V60. This nine-month engineering feat uses precise water "jets" to create optimal turbulence and agitation, achieving a more uniform extraction than manual pouring while maintaining high clarity.
Source: Filter3 basket explained with Kaffee Macher and Scott Rao
Scott Rao and Benjamin (Kaffee Macher) explain the Filter3, a "no-bypass" deep basket for the Decent DE1. Unlike earlier spray-head attempts, this 8cm-deep design uses paper filters and precise flow control to force all water through the grounds, delivering high-extraction, ultra-clear filter coffee with automated consistency.
Source: Video: how to remove a gasket
This video demonstrates removing a group head gasket using Decent's specialized dental-style hook tool. To remove, insert the hook into one of the brass holes, twist for grip, and pull steadily from multiple points. Decent now uses light-grey silicone gaskets for easier cleaning visibility and better longevity.
Source: Video: Allongé with Switzerland's Kaffeemacher
John and Benjamin from Kaffee Macher discuss the Rao Allongé, a high-flow espresso profile for light roasts. By prioritizing flow control over pressure, the Decent replicates filter-like clarity and sweetness in a large-volume shot, demonstrating how precise data-driven brewing overcomes the typical sourness of light-roasted beans.
Source: Time-based flow limiting: thoughts from Maro machine review
John analyzes the Maro machine's "correction" feature, which adjusts flow rates to hit a target shot time. While skeptical of "time-based" taste benefits, John discusses how this mimics flow profiling. He suggests humans—and eventually AI—provide better grind advice than simple automated rules based on peak pressure.
Source: Not everyone is making Decent coffee: thoughts on how to improve that
John discovers that only 1/3 of Decent users consistently make good coffee. Success correlates with modern profiles like Londonium and Adaptive, while failure often stems from outdated "Classic Italian" settings. To improve, John plans to simplify profiles, launch "Groupthink" community assistance, and encourage high-quality, standardized bean selection.
Source: How to use the "Upload to Visualizer" extension in the DE1 app
This guide explains how to sync your DE1 with Visualizer.coffee. After creating a web account, enable the extension in the app's settings. Every shot then uploads automatically, allowing you to track notes, analyze graphs, and share profiles with the community for better consistency and collaborative learning.
Source: Our Free Espresso books, now in English, French and German
WE offer two free digital books, Everybody Espresso! and Everybody Latte Art, now translated into English, French, and German. Available in PDF, HTML, and ePub, these guides cover general coffee knowledge—from roasting levels to tamping posture—rather than machine-specific instructions, making them accessible to all home baristas.
Source: Latte Art Para Todos! (Spanish version)
We have released the Spanish version of Dennis Hew's book, ¡Latte Art Para Todos! This licensed, updated guide provides comprehensive tutorials for mastering latte art. It is available for free in digital formats (English, German, Spanish, and French) via Decent's website, with a print version also on Amazon.
Dialing in the Rao Allongé and Adaptive v2 profiles
We explain how to master two essential profiles. The Rao Allongé uses a 5:1 ratio for light roasts, prioritizing fruit clarity through high flow. Adaptive v2 automatically adjusts flow to hit peak pressure, ensuring balanced, consistent extractions regardless of grinder type or roast level.
Source: 5 espresso profiles for light roasted coffee beans
We showcase five profiles for light roasts: Gentle & Sweet (beginners), Extractamundo Dos (hiding defects), Adaptive v2 (balanced consistency), Blooming (maximum extraction), and Allongé (easiest for ultra-light beans). We demonstrate how each manipulates flow and pressure to maximize sweetness and clarity while minimizing acidity in light-roasted coffee.
Source: Why is the flow curve shaped differently with different coffees or grinders?
We explain how puck resistance dictates flow curve shapes. Flow rises as solubles dissolve, but fines migration can increase resistance. Modern flat burrs create uniform particles that extract quickly, causing dramatic flow changes, while traditional conical grinders produce broader distributions for stable, moderate flow through tighter packing.
Source: 5 profiles for dark roasted beans
We detail five profiles for dark roasts: 80's for fruitiness, Londonium for body without harshness, Cremina for traditional strength, Best overall for milk drinks, and E61 for balanced acidity. Use these to move from fruity notes toward classic Italian flavors while maintaining total extraction control.
Source: 5 profiles for medium roasted beans
We feature five profiles for medium roasts: Default for classic lever-style declining pressure, Flow Profile for fruity espresso/milk drinks, Londinium for rich body, Adaptive v2 for automated consistency, and D-Flow for dynamic versatility. These manage the chocolate-to-fruit spectrum while compensating for varied grind sizes and puck resistance.
Source: D-Flow: an easy editor for the Londinium family of espresso profiles
We introduce D-Flow, a versatile editor for the Londinium profile family. Instead of rigid programming, we let you adjust variables like infusion pressure and temperature in real-time. By linking flow and pressure, D-Flow automatically compensates for grind size errors, ensuring fast, efficient, and consistent lever-style extractions.
Source: Scott Rao makes Filter3 coffee
We explain Scott Rao's Filter3 method: a fully automated process for making high-quality filter coffee on the DE1. Using a specialized basket and 22g of coarse grounds, the machine manages precise bloom times and declining temperatures. It delivers consistent 22% extractions and exceptional clarity with just one button press.
Source: Scott Rao masterclass: Allongé vs. standard espresso: roast level, rlow rate & flavor
In this masterclass, Scott Rao explains how flow rate and roast level dictate flavor. We demonstrate that light roasts benefit from high-flow Allongé profiles to highlight fruitiness, while dark roasts require shorter, gentler extractions to avoid bitterness. Scott also shares tips on using paper filters to minimize channeling.
Source: Scott Rao Masterclass on Blooming Espresso, Filter 3 and what about Quakers?
We explore Scott Rao's techniques for light roasts: Blooming Espresso for high extraction, and Filter 3 for no-bypass brewing. We also discuss how removing "Quakers" (underdeveloped beans) eliminates astringency, and why faster fill rates and optimized headspace improve water distribution and shot clarity on the DE1.
Source: How calcium in water destroys an espresso machine
We explain how high-calcium water causes catastrophic limescale buildup, completely clogging heaters and valves. Even with the DE1's durable stainless steel tubing, poor water quality leads to costly repairs. We emphasize using low-calcium water and regular descaling to protect your machine's internals and maintain your warranty.
Source: Video: Jem, Lance, Rao argue Home vs Cafe for best coffee
In this debate, Jem Challender, Lance Hedrick, and Scott Rao agree: the best coffee is now made at home. They argue that home precision—specifically via the Decent machine—outperforms cafes by avoiding mediocre extractions and rigid 9-bar shots, shifting the café's value from quality to social experience.
Source: Gagne espresso book excerpt: beverage types and recipes
We present a free excerpt from Jonathan Gagné's The Physics of Espresso. We cover advanced extraction recipes including Blooming, Rao Allongé, Turbo, and Adaptive profiles. The chapter also explores filter brewing on espresso machines and specialized techniques like the "Nomacano," providing a scientific foundation for modern espresso styles.
Source: Free book extract from The Physics of Espresso: Shower screens and headspace
We share a free excerpt from Jonathan Gagné's The Physics of Espresso. We explore how shower screen design and headspace impact water distribution. Gagné's research highlights our "Freckles" and "Dimples" screens, demonstrating that reducing headspace on the DE1 significantly increases extraction yields and improves shot consistency.