1Zpresso
J-Max
$199Cheaper
Best Coffee Grinders · head-to-head
J-Max vs C40 MK4 Nitro Blade
A sourced, side-by-side comparison. J-Max is cheaper at $199. Every spec and price links to its source.
Comandante
C40 MK4 Nitro Blade
$325
Released 2021
Which is better: the J-Max or C40 MK4 Nitro Blade?
The C40 MK4 Nitro Blade wins 1 of the 1 specs we compare head to head; the other wins 0. The J-Max is the cheaper at $199. Get the C40 MK4 Nitro Blade for the stronger spec sheet, the J-Max to spend less.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | J-Max | C40 MK4 Nitro Blade |
|---|---|---|
| US price | $199 | $325 |
| Brand | 1Zpresso | Comandante |
| Released | — | 2021 |
| Type | manual | manual |
| Burr type | conical | conical |
| Burr size (mm) | 48 | 39 |
| Grind settings | 90 clicks per rotation (8.8 µm/click), external dial | ~40 clicks per rotation |
| Hopper capacity (g) | 40 | 40 |
| Best for | espresso | all |
| Weight (lb) | 1.7 | 1.63 |
| Release | — | 2021 |
Sources — J-Max: 1zpresso.coffee (verified 2026-06-19). C40 MK4 Nitro Blade: prima-coffee.com (verified 2026-06-19).
What's the difference between the J-Max and C40 MK4 Nitro Blade?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Burr size (mm): J-Max 48 vs C40 MK4 Nitro Blade 39
- Grind settings: J-Max 90 clicks per rotation (8.8 µm/click), external dial vs C40 MK4 Nitro Blade ~40 clicks per rotation
- Best for: J-Max espresso vs C40 MK4 Nitro Blade all
- Weight (lb): J-Max 1.7 vs C40 MK4 Nitro Blade 1.63
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
J-Max
No sourced tester review yet.
C40 MK4 Nitro Blade
Only one whitelisted hands-on reviewer survived verification: Tom's Guide, which lab-measured grind uniformity (Kruve sieves), retention (scale, before/after) and grind speed, and named the Comandante C40 MK4 Editor's Choice. Every quote and measured value in this entry was confirmed verbatim against the fetched article. Verdict: best-in-class hand grinder for consistency and low retention, but slow to crank at fine settings and very expensive. (1 sourced review, 1 lab-tested.)
Praised: Consistent, uniform grind across the full range (verified via Kruve sifter test); Low grind retention, averaging 2.75%; Exceptional build quality and ergonomic body/handle.
Flagged: Very expensive (~$277-$323); Hard and slow to crank at finer settings (below ~20 clicks); No indicator showing the current click/grind setting.