For the V2, I had a couple questions about the ceramic bowls and keeping them clean.
Pots for Series 1 and 2 are the same. Except when I use the 2, I use the thicker o-rings, though either will work.
I always empty when warm, even if that means re-heating a spent pot. I just tap it flat down a few times on a counter, tabletop, ashtray, whatever.
A long while back I stopped taking o-rings and screens off; now I drop the whole pots in 99% iso for anywhere from 20 minutes to a couple of hours, give a little jiggle occasionally, then in a bath in cold water with a drop of Dawn, before a good a rinse. I usually clean 10 or 12 at a time.
(If there are a lot of crumbs, I bathe the pots in hot water first, before the iso bath)
Yes there is a tiny lip at the bottom of the pot. The screens are formed to slightly covex, so there is a bit of spring tension holding the screen in place.