A little more feedback on the model 6000:
I've loved the last 18 days of not having to fuss with the temp! However, this is what I've noticed thus far and what I'm experiencing going into lockdown:
1. I have the unit set to 101 but it spends about 80% of its time at 99 on the digital readout. It's like it struggles to keep 101 on the readout. Regardless of the fluctuations on the digital readout, it seems to keep a consistent 101 inside. The second shelf is .5-1 degree lower than the top, and my home-made third shelf, about 3" off the bottom, is another .5-1 degree cooler. I think altering the design for a more stable interior temp, top to bottom, would vastly improve feedback and marketability.
2. Related to point 1 is a problem I had going into lock-down. The holes in the shelves are too big to leave uncovered. The chicks will fall through, especially my banties. So I covered them, first in wash clothes, which rocketed the temp up to 105 at the top and pushed the bottom home-made tray down to 95 very quickly. So I swapped the rags out for cardboard with holes cut in for air flow, but it barely changed the issue. I don't know if the air flow was restricted more because of the surface area, or because I blocked the 1" gap between the shelved and the door, but I moved the eggs into my LG for hatch after fussing for over an hour. There are definitely some hurtles with the 1" gap between the door, large shelf holes, and overall temp inequality.
3. I mentioned before that making a 'maximum shelf' model with more shelves and more brackets would increase the appeal of the unit exponentially (for those of us who hoard eggs!).
4. Usually in incubators the water source is by the heat, but the water being on the bottom and the heat being on the top makes for less efficient evaporation. However, I usually dry incubate and have not needed to fill trays during incubation.
I'm going to experiment with the 'mute' fan mode option. I'm wondering if having mute mode 'off' is causing more of a temp gap with the fan working harder on the bottom.