Metric Coffee · Colombia Carlos Efrain Cortes

Sat, Jul 18, 2026, 1:40 PM (Shot 81)

DoppioFastNormalDay 12 · Too fresh — wait (2d)

Shot

Grind Setting29

Dose18g

Grinder Retention0.4g

Adjusted dose 17.6g

WDT UsedYes

Distribution ToolYes

Spring Weight30 lbs

Pre-infusion6s

FlowNormal

Shot Time24s

Stopped at29.4g (+10g drip)

Yield39.4g

Ratio 1:2.241.64 g/sFastNormal

Target

Espresso

Aiming for Espresso (35.2g, 25–30s) — +4.2g off, ran fast.

Taste

Balance

SourSlightly SourBitter

Shot Rating

★★★★★

Notes

Flow was even across both spouts starting at around 12 seconds. Slower than previous shots but still fast. Taste was bright and lingering with fruity tones. Even though the numbers improved I seem to have preferred the taste of the previous shots better. Still under extracting so planning to reduce grind by 1.5 to 2 clicks for the next shot

Drink

DrinkFlat White

Milkwhole

Milk Quantity80ml

Foam10ml

Overall Rating

★★★★★

Latte Art

Calder

Good balance with bright and fruity notes. Missing body and sweetness. Milk was foamed properly and latte art was controlled blobs before airy foam created another blob

Analysis

✦

AI Analysis

Needs Work

Summary

Grind 29 hit 24s and a Normal ratio — real measurable progress from the 15–16s shots at grind 34 and 40. Flow was even across both spouts, which is a clean puck prep result. The lingering brightness and fruity notes confirm under-extraction is still present, and the lower quality rating versus previous shots tracks — numbers improved but taste didn't land yet. Worth noting the bean is 12 days off roast; light roasts typically peak around 14 days, so some extraction resistance is still baked in.

What the Numbers Say

Time is Fast (24s) — just short of the Normal floor at 25s. Ratio is Normal at 2.24. The lag_g field shows 10g this shot, which is on the higher end of normal Bambino drip behavior — no action needed. Balance 3 (Slightly Sour) matches what the numbers predict: slightly under-extracted. Notes confirm the sourness lingers, which is the real extraction flag here, not just bean character brightness.

The One Thing to Change

Drop to grind 27.5 as planned — 1.5 clicks finer from 29.

24s is one step below Normal. Lingering brightness with fruity notes on a washed light roast is consistent under-extraction, not bean character. The 1.5-click drop is the right calibrated move — not so aggressive that you overshoot into choking territory, but enough to close the last gap. Bean freshness at day 12 may still be adding resistance; if 27.5 still runs fast, hold the grind and let the bag rest to day 14 before adjusting further.

Bean Context

Colombia Carlos Efrain Cortes is a high-altitude (2015m) washed light roast — Limoncello and Blackberry notes will read bright by design, but lingering acidity after stirring is still an extraction signal on this bean. At 12 days post-roast, you're right at the edge of the estimated peak window for a washed light roast (~14 days). The slight extraction resistance you're fighting may ease in 2 days naturally. Grind 27.5 is the right next step — just keep day count in mind if results stay stubborn.

Progress

Three shots in and you've gone from 15s to 24s — that's a significant calibration arc in a short run. Even flow this shot confirms puck prep is clean. The gap now is purely extraction depth, not technique.

Cached · Jul 18

Bean

RoasterMetric Coffee

BeanColombia Carlos Efrain Cortes

Days Since Roast12 days — Too fresh — wait (2d)

Roast Date2026-07-06