Very optimised ratios
Fully beaconed 8x8 (1 to 8, 8 to 1)
Inputs:
1 blue belt of iron ore
2 blue belts of copper ore
1 red belt (2 yellow belts) of coal
Petroleum gas from side
Output: 1 full blue belt of red circuits
You can also check <a href="https://factorioprints.com/view/-LRJE1kgeesiD8Djqa4C">Green</a>, <a href="https://factorioprints.com/view/-LRqp9pTAG9DICY3rVNh">Blue</a>