The duty cycle for the pumps is something like 1 min on, followed by 1 minute off. But that assumes full power - 50/60Hz. At a slow flow, the pump is running nowhere near that rate, so can operate indefinitely

I think it's a great machine, but "by no means right for everyone"

I'd be careful about a "great leap forward." Jokes aside, I totally agree

This raises the question of whether there is some ideal pressure for a "bloom." With my DE1+, I actually was targeting atmospheric pressure, but I determine that I've filled the headspace by checking for a rise in pressure, and the intermittent pressure is noisy enough that I've settled on about 1 b...

Well, Rao got 24%. I don't know what I got. Post-shot puck weight math suggests, maybe, 23%. I get a very chocolatey, fairly full-bodied cappuccino using a fairly dark roast and a Central American bean. My tentative conclusion is that I get more complexity with 16 g in an 18 g basket versus in a 15 ...

Hi, all. Here is some data the folks reading this thread might find interesting. I've been using my Decent DE1+ and its advanced profile feature to preinfuse at moderate volume (3 mL/s) into a 16 g. puck until I detect just a bit of back pressure (1.3 bar), and then letting the puck bloom for 30 sec...

My profile (and an explanation) are now available in the "Basecamp Decent forum". For the non-Decent owners, here is the explanation I posted there, in case you're interested. (You can also look at the profile file itself, though I won't try to explain the format of that file.) The explanation below...

I will post the actual profile file in Basecamp

That was my first attempt, but the threshold checking is happening at a very high sampling rate, and right at the switch from flow to pressure there can apparently be a momentary spike in flow. So you need a flow w/exit if pressure > x, the pressure at x for a couple of seconds to let things settle ...

Hah, I think that is actually the profile I developed! (Or at least based on it.) So, yes, in reality I don't use a pure flow profile. But more often than not I don't hit the pressure cap, so on those mornings I'm effectively using a flow profile