Too bad I had already steamed the oat milk. It was the most delicious latte I have ever had. 7 bar peak and a slow decrease for the Counter Culture Apollo, 20 in 48 out in 50 seconds. The tiger stripes aren’t channeling, in and of themselves: there was minimal channeling in the puck (the small dots at the edges) until it began to erode towards the end (where the larger spots start appearing, in the same places in relation to the earlier small spots: no puck has no channeling, and all pucks erode through the length of the shot), but you can definitely see where the initial channeling increases over the length of the pull.
Notice that the “meat” of the shot doesn’t show channeling. I think this is a result of the grounds expanding and contracting and then contracting and expanding through the pressure release, as water is forced into the coffee and then forced out. The initial pressure opens the small imperfections in the bed, but then they close from 6-3 bars, which is about 40 seconds of the shot. When the pressure reduces enough towards the end they open back up. Obviously, visually, in the same places in the bed: no additional channeling happens during the shot.
The rings are a result of the ramp down in pressure, and the pretty distribution is just because I somehow didn’t fuck up and the ramp down was even, and pausing for a tiny bit watching the gauge with each marking. Puck was as pretty as you please. I just love that you can count the ramp down from 7 bars pressure in the rings.
I would call that minimal channeling.