There was some discussion today on another thread on this very topic, albeit not necessarily on the topic of worm bins but worms in general. For those who might be interested here is one I designed back in 1980 using a 2’x3’x8’ metal trough. What I like about this size is it allows placing hot mixes (manures, coffee grounds, etc.) on one end of the bin during the winter month’s so the worms can migrate to a distance that suits them, thus keeping them active year round.
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