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Compact Silicon Arc

Stackable Silicon Arc Furnace.
Inputs come at the top. The four routers directly above the furnaces take sand. Graphite goes through the ducts in between the furnaces. The ducts at the side take the silicon output. This can be stacked up to six times (12 furnaces in total) if you have enough input, but the output will clog after the third furnace if they're all running at max capacity.