I have the Eco, but I thought this might be interesting to some, regarding max amount of eggs it's capable of holding (without a turner, obviously).
My first attempt at hatching was little Serama eggs. I squeezed 14 of them puppies in the Mini, and two of them were in carton cups for detached air cells. If they weren't in cups, I probably could have squeezed in a couple more. Sadly, I had 0 hatch.
Then I tried my hand at LF EE/OE eggs. I had 24 eggs, but could only pack 9 in there at most. (Had to throw together a homemade styrobator for the rest.) I don't have a picture of the 9, but they were packed. They were pretty big eggs, though. In the end, I ended up with 4. More about that below.
This time, I'm trying Coturnix quail eggs. I managed to fit
32 eggs in there, with room for at least one more.
Keep in mind, though, this is without a turner, so you have to turn manually and when they're packed like sardines, it sometimes gets pretty difficult. Also I would NOT recommend hatching out of the Mini when they're this cramped. Have a separate hatcher preferably if you end up with a lot of eggs still at lockdown. With the 9 LF EE eggs, only 4 made it to lockdown and hatched, and I can now say I would not try hatching out more than 4 or 5 LF in it for space reasons. It would be unbearably cramped in there for them with more than that I think (not to mention, LF chicks can't stand up fully with the low "ceiling", so get them out fairly quickly):
Come spring, I'll be testing various duck and geese eggs in it.