@ohfp maybe I could somehow improv a space in my dehydrator for that…?

@elilla might be worth a try – as long as you have a reliable enough thermometer, I don't see why not ^^

Had to rack my brain a bit, but now remembered which site's instructions I used aaaaaaaaages ago to get started (defunct nowadays, of course): https://web.archive.org/web/20160206012822/http://www.nattoking.com/

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To All the Natto Lovers