espresso channeling prevention 3

https://sessioncoffeedenvercoffeeblog.juniperbrief.com/posts/understanding-coffee-channeling-causes-and-fixing-your-espresso-flow

To prevent espresso channeling, ensure your coffee grind is consistent and your tamping is level. A distribution tool can help break up clumps before tamping. Also, check that your machine's pressure is stable and not too high, as uneven water flow often causes those pesky holes in the puck.