Instant pot sounds like a good idea! My housemate built a custom incubator in a styrofoam cooler. We made some good tempeh. We had one batch of good natto, then

Instant pot sounds like a good idea! My housemate built a custom incubator in a styrofoam cooler. We made some good tempeh. We had one batch of good natto, then it went south. When natto goes wrong, it goes REALLY wrong. It's already pretty borderline :P