Octa set lvl9 self sustaining steam engine
This is based on the quad setup. I modified the bottom layer of lava gen. to a quad of 3x4 cauldrons instead of a qud of 3x3's like the first layer. So far it is holding up to demand. system generates 1.17m using less than 1% (system registers it at 0%). Like others I go for a small footprint at ground level.