I’m organizing a latte art throwdown in Riverside Park on May 18 and need a reliable portable grinder that can keep up without wall power — leaning toward a Comandante C40 or 1Zpresso JX-Pro, but open to a compact electric that runs off a battery pack. If you’ve used one for 100+ drinks in a 3-hour window with volunteers swapping in, what held calibration and cleaned up fast between rounds?
Did a riverside jam last summer with a JX‑Pro — about 130 drinks in 3 hours with 3 volunteers — and it stayed locked at our setting… A tiny blue‑tape tick mark on the collar plus a quick RDT meant it ‘held calibration and cleaned up fast’; we just brushed out the chute between shifts. C40 felt smoother but a hair slower; if you want electric, I’ve run a Fellow Opus off a small Jackery without issues — your forearms will thank you.
I’ve run a C40 for about 120 drinks; slipping a thin silicone O‑ring under the click dial kept the setting from drifting when volunteers bumped it — @diane_reed33 is right on throughput, but if you switch to an Opus + Jackery expect a touch more static to wipe.