Question 1

Is 3.0.2 on a 1Zpresso JX-Pro the same as 3.0.2 on a Fellow Opus?

Accepted Answer

No. The two grinders count in different steps, so the same number gives a different grind. 3.0.2 on the 1Zpresso JX-Pro matches about 4.5 on the Fellow Opus.

Question 2

How accurate is this conversion?

Accepted Answer

It is a starting point. Both grinders are mapped to particle size in microns, fitted from the Honest Coffee Guide charts for each brew method, not from manufacturer burr-gap specs. Beans, roast and burr wear change the result, so adjust by taste.

Question 3

The coffee tastes sour or bitter after converting. What should I change?

Accepted Answer

Sour and thin: grind finer by a step or two. Bitter and harsh: grind coarser. Change one thing at a time.

Brew method	1Zpresso JX-Pro	Fellow Opus
Espresso~250 µm	1.3.3	1.25
Moka pot~350 µm	1.9.1	2.25
AeroPress~450 µm	2.4.2	3.25
V60~560 µm	3.0.2	4.5
Chemex~700 µm	3.8.1	6
French press~900 µm	4.9.0	8.25
Kalita Wave~600 µm	3.2.3	5
Cold brew~1100 µm	6.0.0	10.25
Siphon~650 µm	3.5.2	5.5

1Zpresso JX-Pro to Fellow Opus

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