That machine is very interesting! If you own one of them, would you mind sharing how roast chamber works? I've thought a bit about how that could be done in a fully-automated fashion, but I'm curious to see what solution they came up with.
Roasting immediately before brewing is not a great idea.
I've been roasting my own beans for 20 years, and one of the first things I learned is that hardly any beans are at their best right after roasting. Freshly roasted is OK, but the beans are outgassing for some time after that. 2-3 days rest after roasting improves the flavor of just about any coffee, especially the fruity dry process Ethiopians I like.
Feel free to email me (address in profile) if you'd like to talk about home roasting - always happy to kick it around with anyone interested.
Also visit https://www.sweetmarias.com/ for lots of information about green coffee and roasting, grinding, and brewing equipment. (I am not affiliated with them at all, just a long time customer.)
Yes, I it is probably a copper slab (they never mentioned), but there is no electrical connection, as the rest of the slides make clear: https://imgur.com/a/Rbd7e4D
It just provides a thermal connection for water cooling. The electrical connection is made through the PCB (and probably through a thick copper plate on the opposite side of the PCB)
