I've been working on a self-sustaining rubber and tree farm, and so far I haven't been able to find a decent way to return excess materials. I have humus coming from the ender chest, resupplying the arboretum when necessary and going up through the stone pipe back to the ender chest when it's full. It works alright, but by the time the redstone engine gets warmed up there is a constant stream of humus circulating through the pipes. Is there a way to have the redstone engine shut off when the arboretum is full or another way that is still self-sustaining but without all of the entities constantly flowing around?
