Turning Mystery into Engineering: How Vihi Redefines Pour-Over Coffee

In many parts of the coffee community, pour-over brewing is often described as “unpredictable.”
Same beans, same steps — different results.

But in engineering, unpredictability simply means a variable that has not yet been measured.

At Vihi, our mission is clear:
We turn what once felt mysterious into measurable, repeatable coffee engineering.

01｜Why Pour-Over Often Feels Unpredictable

Several structural variables affect brew consistency:

• Paper deformation → unstable flow
• Uncontrolled water pathways
• Fines generation from hopper pressure
• Extraction curves that can’t be replicated

These are what create the “mystery” behind pour-over brewing.

02｜How Vihi Brings Engineering Into Coffee

✓ V-Fold: Precision in Paper Geometry

Kalita Wave filters naturally deform due to manufacturing and stacking.
V-Fold restores a precise 38.3° geometry so every filter behaves the same.

This achieves:

• More linear flow
• Better repeatability
• Improved fines retention along the wall

✓ G-Flow: A Controlled, Motor-Driven Feeding System

Traditional hoppers rely on gravity, causing beans to rush into the burrs:

• Bean-to-bean compression → more fines
• Sudden burr load → inconsistent grinding

G-Flow introduces a fully engineered solution:

• Motor-powered rotating disc
• A purpose-designed slow-feed channel
• True “single-bean / small-dose feeding”

It connects to the grinder through a dedicated adapter,
which will officially launch on January 1st, 2026.

The results:

• Fewer fines
• Cleaner extraction
• Smoother, more predictable curves

03｜Vihi’s Philosophy: Coffee Should Not Rely on Luck

Our core belief:

We engineer the parts of coffee people once thought were unpredictable.

• Stability over luck
• Repeatability over intuition
• Structure over randomness

04｜Coffee Science Should Be Accessible

We aim to bring structural engineering, fluid dynamics, and material science into home brewing.

V-Fold and G-Flow are only the beginning.

Our upcoming research will explore:

• Even more precise paper geometry systems
• Fluid-simulated dripper structures
• Smart extraction modeling
• Home-level engineered brewing systems

We believe every coffee lover deserves their own “coffee engineering toolkit.”

Conclusion

Coffee is not mysterious — it simply needs to be engineered.

And Vihi is the team doing exactly that.