Specs
| Type | Hand grinder with a 48 mm burr, the same geometry as the 1Zpresso K series 18:54 2:33. A 2025 review gives 32 mm and calls it a scaled-up P2 heptagonal 22:27, so the sources disagree. |
| Adjustment | External numbered ring with clicks 18:54 22:27 |
| Microns per step | 16 µm per click, from translated subtitles 18:54 |
| Build | Triple bearing, with the burr bolted to the axle by three bolts 22:27. The top takes a drill 18:54 |
Where sources disagree
The creators don't all give the same figure here, so every value is listed with the person who gave it.
| Field | Value | By | Source | Note |
|---|---|---|---|---|
| Burr size (mm) | 48 | Hedrick | 18:54 | from translated subtitles |
| Burr size (mm) | 48 | Hedrick | 2:33 | |
| Burr size (mm) | 32 | Hedrick | 22:27 | |
| Burr size (mm) | summary | Two reviews give 48 mm and one gives 32 mm. |
Starting settings
No one has shared grind settings for it yet.
Cup profile
- Fairly clean and close to the K-Plus, though the K-Plus won Lance Hedrick's blind comparison 18:54.
- Handles pour-over and espresso, and shines on medium to light roasts 2:33.
- Faster and a little more even than the plastic P2 22:27.
Strengths
Weaknesses
- The grip strap slips 18:54.
Verdict
2022: nearly the K-Plus burr at half the price 18:54. 2023: his top budget pick under $100 2:33. 2024: grade B, or S once you factor in the price 24:09.
Daddy Got Coffee's take
- 2025 and 2026: the most flexible cheap grinder for going from filter to espresso. It feels cheap, though, and some owners have found rust inside after using RDT 4:36 5:07 4:38.
The Coffee Chronicler's take
- 2025: strong value for pour-over, light roasts and espresso, a bit fuller and less clear than a K-Ultra. It feels budget, with a screw-on cup and a fiddly paper-clip axle holder, and he advises against RDT after reports of rusting bearings 29:44.
Sources
- Lance Hedrick: BRIEF GUIDE TO BUYING A HANDGRINDER: Which is best for you with Burr Man (2023-11-29)
- Lance Hedrick: Hand Grinder Tier List (2024-10-02)
- Lance Hedrick: This Budget Grinder Changes the Game (Kingrinder P Series Review) (2025-09-09)
- The Coffee Chronicler: Buying a manual grinder? Here's what I would do... (2025-11-17)
- Daddy Got Coffee: The Ugly Truth About Hand Grinders! (2025-11-29)
- Daddy Got Coffee: If I Started Coffee in 2026… Here’s EXACTLY What I’d Do! (2025-12-20)
- Lance Hedrick: GUIDE TO HANDGRINDERS: Watch Before Buying (2022-06-15)
Summarised in our own words from the creators' videos, with every point linked to the moment it comes from. Notchbook isn't affiliated with or endorsed by any of these creators, so please watch the originals for full context. Sources
Dialling in from here
- Sour, thin or fast? Grind finer. Why coffee tastes sour
- Bitter, dry or slow? Grind coarser. Why coffee tastes bitter
- Espresso: how to dial in. Filter: pour-over grind size.
Compare with other grinders in the grind size chart, or see every grinder.
Notchbook is a free app that remembers the setting that worked on your Kingrinder K6 for each coffee and brew method, and keeps a journal of every brew. Get it free on Google Play. The iPhone app is coming soon. More about Notchbook.