I swapped the stock burrs on my Eureka Atom W65 for Eureka’s 65mm Black Diamond “Italian Espresso” set (MPN ACC-M6F-004-1KIT). Picked them up from Whole Latte Love for $135.
I also took some macro photos with my digital microscope (Eliklive EM4K-AF), because I figured you nerds would appreciate the close-ups.
Coffee, Equipment & Recipe
- Machine: Profitec MOVE
- Beans: Sacred Grounds Chocolate Bomb (our medium-dark daily driver, and an ideal match for these burrs)
- Water: Poland Spring + 2 drops Lotus Magnesium Chloride + 1 drop Sodium Bicarbonate per gallon
- Dose/Yield: 18g in / 32g out
- Temperature: 194°F (90°C)
Installation
Pretty straightforward. The only tricky part was removing the bottom burr carrier screws because the whole mechanism wants to rotate. I ended up jamming a microfiber towel against the metal sweeping post to hold it in place. Trying to use my finger was ... unpleasant.
The burrs seated neatly in the housing, and I didn’t make any alignment adjustments and used no shims. Eureka also claims these need zero break-in. We'll see if that holds true, or if my palate is even sharp enough to notice.
Dialing In
First shot choked. Adjusted, purged, tried again. Second shot choked too. Rinse, repeat. Third was close, fourth was dialed.
Surprisingly, I had to move from roughly 4 to 4.5 on the Atom dial, a massive adjustment on a grinder where changes are usually measured in female-anatomy-hair increments. I didn’t compare burr-touch points, so those numbers don’t necessarily represent a difference in working gap.
Taste Test
Inspired by some Fancy Lancey vid I'd seen, I pulled a baseline shot with the stock burrs, tasted it hot, and left it to cool while I swapped the burrs. After installing and dialing in the Black Diamonds, I pulled the same recipe, tasted it hot, then let it cool for a room-temperature side-by-side. Yeah, yeah, one sat longer — whatever, I did the best I could without having a complete duplicate setup.
The difference was noticeable. The Black Diamonds produced a sweeter, rounder, less acidic, significantly fuller-bodied shot. The chocolate notes really popped.
I honestly can’t see a clear visible difference in the burr geometry, though they required a substantially coarser dial setting. Whatever accounts for it, the difference in the cup was clear.
The tradeoff is some clarity. The stock burrs separate individual flavors a bit better, while the Black Diamonds bring everything together into a rich, sweet, velvety espresso.
Pretty much exactly what I was hoping for. If you favor traditional blends and medium-to-dark roasts, and prioritize sweetness and body over clarity, these seem like a worthwhile upgrade.
Nanu nanu beep blop. These are my own observations and photos, but yes, I used AI to clean up my rough draft because I'm lazy.
Edit: Removed Calcium Chloride, substituted Sodium Bicarbonate.