I've tried to scale down a single fruiting medium to 100-200g, and it keeps failing time after time: at best, I get small needle-sized fruiting bodies (hypsizygus tessulatus, post picture) or primordia and then small malformed underdeveloped fruiting bodies (pleurotus eryngii, inline picture). Then development just stops. Medium is enriched (sugar) alder chips, contamination starts developing long after growth is stalled. Is it really scale problem? What's the reasonably smallest batch size?
Yeah, scaling never really changes one parameter (that's also why I always find it interesting). I've obviously never done it in a huge glass jar and I can see many new potential issues in all the comments here. I think I've got plenty of ideas here, this is amazing community!