Etches 2 copper wire + 1 silica into a circuit board (4 h).
Spirewood ×30, Copper Bar ×3, Silica Shard ×2
Spirewood ×30, 
Copper Bar ×3, 
Silica Shard ×2
Spirewood ×30, Copper Bar ×3, Silica Shard ×2